Pauline the cow; color photo; Whitehouse in background. Pauline belonged to President Taft. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Deutsche kunst und dekoration. 1913. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Buffalo illustration from Italian costume illustration book, 19th century. Il costume antico e moderno, o, storia del governo, della milizia, della religione, delle arti, scienze ed usanze di tutti i popoli antichi e moderni, provata coi monumenti dell'antichità e rappresentata cogli analoghi disegni dal dottor Giulio Ferrario : Europa (1826). Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Buffalo from Buffon, Georges-Louis Leclerc (1754) [Collection des animaux quadrupèdes planches coloriées sans texte]. [s.n.]. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Buffalo scratching neck against a tree trunk that is partially destroyed. Did the buffalo do it? Catesby. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Buffalo woodblock, 16th Century, American?. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Animal locomotion : an electro-photographic investigation of consecutive phases of animal movements : prospectus and catalogue of plates - Muybridge, Eadweard,

American natural history. Part 1.--Mastology (1828). Scans of 2 d objects in the public domain believed to be free to use without restriction in the US.

Vintage French Animal illustrations; engraving, color. Illustrations de Histoire naturelle des mammifères. Cuvier; illustrated by Wermer. 1819. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Vintage buffalo print. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

The book of history. A history of all nations from the earliest times to the present, with over 8,000 illustrations ([1915?-21]). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Musk ox in landscape. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Musk ox. Bos bubalus of Linn. Animals of the Levant. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Proceedings of the Zoological Society, London, 1906. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Chinese clay figures (1914). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Alderney Cow, after Howitt. British cow illustration; black and white engraving. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Black and white diagram of cow parts for cuts of meat. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Black and white diagram of cow parts for cuts of meat. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Alaskan reindeer and cattle herds. Photos. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Couverture de "L'Éclipse", 2ème année, N°55 (détail) Le B½uf Gras du Carnaval de Paris
Date 7 February 1869 (1869-02-07) . Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Source Couverture de "L'Éclipse", 2ème année, N°55 (détail)
Author André Gill

Cow, man. Physiognomonia, 1807. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Dog, man; cow, man. Physiognomonia, 1807. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Wild oxen, buffalo, bison. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Cow with duplicate hind limbs and extra hoof coming out of shoulder blades. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Cows conjoined or with adventitious limbs. Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Calf with adventitious hooves; and conjoined bodies. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Cow walking on hind lmbs; missing front limbs. Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Calf with adventitious legs growing out of shoulder blades. Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Calf with adventitious hooves. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Art, illustration of two strawberry blond women with greyish blue dresses and a cow. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Drapeaux, bannières, souvenir de la "Vielle Flandre" = Vlagen & wimpels, aandenken van "Oud-vlaendren." (1913). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Achillis Bocchii Bonon. Symbolicarum quaestionum, de vniuerso genere, quas serio ludebat, libri quinque (1574). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Boeuf de saint Luc. Martin Schongauer. 15th Century. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Vintage French photographs; black and white. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Museum, Barcelona, Vol. 1 1911. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

36 Views of Mount Fuji - 33. Kogane Plain. Hiroshige. 1858. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Giuseppe Arcimboldo. Horse harness. 1585. Via Web Gallery of Art. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Dressage simplifié du cheval de selle (1886). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

The compleat horseman : or, perfect farrier : in two parts : part I. discovering the surest marks of the beauty, goodness faults, and imperfections of horses ; the best method of breeding and backing of colts, making their mouths, buying, dieting, and otherwise ordering of horses ; the art of shoeing, with the several sorts of shoes, adapted to the various defects of bad feet, and the preservation of good : the art of riding and managing the great horse, &c. : part II. contains the signs and causes of their diseases, with the true method of curing them (1717). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Artistic horse-shoeing : a practical guide and scientific treatise : giving improved methods of shoeing, with special directions for shaping shoes to cure different diseases of the foot, and for the correction of vaulty action in trotters (1899). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

La Perrière, Guillaume: Morosophie (1553) | La Perrière, Guillaume: Morosophie (1553) . Via U of Glascow. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

African invertebrates : a journal of biodiversity research (1906). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

The points of the horse : a familiar treatise on equine conformation (1893). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse hoof anatomy, educational plate. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Le cheval extérieur régions : pied, proportions, aplombs, allures, age, aptitudes, robes, tares, vices, vente et achat, examen des uvres d'art équestre, etc. : structure et fonctions, situation, rapports, structure anatomique et rôle physiologique de chaque organe : races, origine, divisions, caractères, production et amélioration : XVI planches coloriées, découpées et superposées (1886). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Mayhew, Edward, D 1800. "The horse's mouth : showing the age by the teeth / Containing a full description of the periods when the teeth are cut; the appearances they present; the tricks to which they are exposed; the eccentricities to which they are liable; and the diseases ..." Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Le cheval extérieur régions : pied, proportions, aplombs, allures, age, aptitudes, robes, tares, vices, vente et achat, examen des uvres d'art équestre, etc. : structure et fonctions, situation, rapports, structure anatomique et rôle physiologique de chaque organe : races, origine, divisions, caractères, production et amélioration : XVI planches coloriées, découpées et superposées (1886). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Le cheval extérieur régions : pied, proportions, aplombs, allures, age, aptitudes, robes, tares, vices, vente et achat, examen des uvres d'art équestre, etc. : structure et fonctions, situation, rapports, structure anatomique et rôle physiologique de chaque organe : races, origine, divisions, caractères, production et amélioration : XVI planches coloriées, découpées et superposées (1886). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Le cheval extérieur régions : pied, proportions, aplombs, allures, age, aptitudes, robes, tares, vices, vente et achat, examen des uvres d'art équestre, etc. : structure et fonctions, situation, rapports, structure anatomique et rôle physiologique de chaque organe : races, origine, divisions, caractères, production et amélioration : XVI planches coloriées, découpées et superposées (1886). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse illustrations; color engravings, 19th Century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse illustrations; color engravings, 19th Century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse illustrations; color engravings, 19th Century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse illustrations; color engravings, 19th Century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Arabian Horse on some nice hay. can of 2 d images in the public domain believed to be free to use without restriction in the US.

Buffon, Georges-Louis Leclerc (1754) [Collection des animaux quadrupèdes planches coloriées sans texte]. [s.n.]. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Mores Italien, 1575, via Yale U. Color illustratio of man on a horse with a black umbrella. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Buffon's Quadrupeds. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Buffon's Quadrupeds. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

The Illustrated magazine of art: containing selections from various departments of painting, sculpture, achitecture, history, biography, art-industry, manufacturers, scientific inventions and discoveries, local and domestic scenes, ornamental works, etc (1853). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Horse, man. Physiognomonia, 1807. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Stylized horse, rabbit, goat, dog; full of curly cues. Black and white engraving. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Infants' Cabinet of Birds and Beasts 1820. Black and white engraving. Vocabulary book. Scan of 2 d image in the public domain believed to be free to use without restriction in the US

Black and white drawing, back side of horse. Diagrammed. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Horace Vernet, 1820. A soldier on horseback, both of them urinating; seen from behind, another soldier in distance .
Graphite, with brown wash. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

101 Ranch Wild West: Cowgirl Bronco Buster. 1912. Via Ringling.org. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

William John Wilgus, Ichabod Crane and the Headless Horseman, c. 1855 NGA. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Allegory of Freedom. NGA. Ca.1863 African American soldier standing by American Flag during Civil War. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Crazed horse. Eugène Ferdinand Victor Delacroix. Painting of bucking white horse with lightning in the background. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

"Femme nue à cheval, tournée vers la droite" Georges Jules Bertrand. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Zoopraxiscope, early film, 1893. Horse trick. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Eadweard Muybridge (1830-1904) The Horse in Motion, 1878. Scan of 2 d image in public domain believed to be free to use without restriction in the US.

Stop motion photo; race horse locomotion. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

The horse, its treatment in health and disease with a complete guide to breeding, training and management (1906)

Giuseppe Arcimboldo. ca. 1550.
Composition with Animals. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Goat. Jacob Jordaens. Flemish, 1593 - 1678. 17th century. Red, black, and yellow chalk, with touches of red and brown wash heightened with white. "This drawing is connected with the painting Adoration of the Shepherds, 1657, in the North Carolina Museum of Art." Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

William Holbrook Beard; paintings of animals in narrative settings. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Têtes de chats, un lapin , une tête de chèvre. Boel Pieter (1622/1625-1674). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Japanese (?) woodblock prints of animals in the woods; black and white. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Juvenile illustration. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Proceedings of the general meetings for scientific business of the Zoological Society of London. 1899. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep. French animal illustrations, color, 18th century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Goats. French animal illustrations, color, 18th century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Billy goat in barn yard. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Three horned gray goat. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Billy goat. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep illustration. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Sheep illustration. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Die Republik Argentinien; ein Wegweiser für Fremde und Auswanderer (1883). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Vintage French Animal Prints. Complements of Buffon, 1838. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Lincoln Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Tunis Ram. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Dorset Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Shropshire Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Southdown Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Rambouillet Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Suffolk Down Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Cotswold Ram. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Hampshire Down Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Cheviot Ewe, and not from Cheviot Hills which is Beverly Hills adjacent. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Oxford Down Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Leicester Ram. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical American Merino Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Typical Delaine Merino Ewe. Photos of sheep, or otherwise known as sheep photos. Sheep looking sheepish. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Sheep (1837). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

A vicuna, black and white engraving. Brehm, Alfred Edmund; Pechuel-Loesche, Eduard; Haake, Wilhelm. "Brehms Tierleben. Allgemeine Kunde des Tierreichs. Säugetiere - Dritter Band." (1900) Leipzig und Wien, Bibliographisches Institut. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Boys of other countries (1912). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Ulisse Aldrovandi, animals; Italian illustration. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

"'A midsummer's night' Original etching in colours by William Giles." Arts and crafts style. This looks like California, but it is Great Britain: sheep resting under what looks like eucalyptus trees, as the sun is an orange egg yolk over the sea. Scans of 2 d images in the public domain believed to be free to use with out restriction in the US.

Farm animals. Oeuvres complètes de Buffon (1830). Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Farm animals. Oeuvres complètes de Buffon (1830). Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Tête de chamois. Gustave Courbert.Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Painting of Wallachian sheep. Scan of 2 d image in the public domain believed to be free to use without restriction in the US

Antelope . Vintage French Animal Prints. Complements of Buffon, 1838. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Ulisse Aldrovandi, animals; Italian illustration. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Antelope educational plate. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Italian images; early naturalist. Scan of 2 d images in the public domain believed to be free to use without retstriction in the US.

Moose. French animal illustrations, color, 18th century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Deutsche kunst und dekoration. 1905. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Vintage French Animal Prints. Complements of Buffon, 1838. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Llamas. French animal illustrations, color, 18th century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Die Republik Argentinien; ein Wegweiser für Fremde und Auswanderer (1883). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Life among the people of Eastern Tibet (1921). Scan of 2 d images in the public domain believed be free to use without restriction in the U.S.

Animals of the Levant. Camel. Camelus araia of Pliny Camelus dromedaries. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Scan of 2 d images in the public domain believed to be free to use without restriction in the US. From Wellcome Images. Seven different specimen of the family Suidae (pigs) shown in their natural habitat.

Rembrandt Harmensz. van Rijn. 1643. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Boar, from Italian medieval manuscript. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Farm animals. Oeuvres complètes de Buffon (1830). Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Farm animals. Oeuvres complètes de Buffon (1830). Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

(Antonio Pisano) Pisanello [1395-1455]. A Wild boar. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Baby pig. Smit.porcula.salvania. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Wild boar and piglets. French animal illustrations, color, 18th century. Scans of 2 d images in the public domain believed to be free to use without restriction in the US.

Vintage animal photos, including what looks like baby boar. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

A boar. Vintage French Animal Prints. Complements of Buffon, 1838. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Pig. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Biggle swine book (1912)

Something like an ocelot or small spotted cat with a leash and different face; and a bristled pig with an arrow in it. Ulisse Aldrovandi, animals; Italian illustration. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Ulisse Aldrovandi, animals, pathology and monsters. Italian illustration. Dog with extra hind limbs; pig with boy face with heart shaped opening in forehead. Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

Niko Pirosmani. Boar. Oil on oilcloth. State Art Museum of Georgia, Tbilisi, Georgia.

Niko Pirosmani. Sow with Piglets. Oil on cardboard. The Tretyakov Gallery, Moscow, Russia. Scan of 2 d image in the public domain believed to be free to use without restriction in the US.

Untersuchung über die Haut des Schweines (1894). Scan of 2 d images in the public domain believed to be free to use without restriction in the US.