Geopolitical – Map – America – Black Hills, bird’s eye view

Geopolitical - Map - America - Black Hills, bird's eye view

Bird’s eye view of the Black Hills to illustrate the geological structure. Dept. of the Interior, U.S.G. and G. Survey, J.W. Powell, in charge. Geology of the Black Hills by Henry Newton, E.M. (Julius Bien, Lith. New York, 1879) . Scan of 2 d images in the public domain believed to be free to use without restriction in the US.

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