Evolution of the Conservation Movement, 1850-1920

Evolution of the Conservation Movement, 1850-1920
The physical geology of the Grand Canyon District, by Capt. Clarence E. Dutton, Ordnance Corps, U.S.A. From Annual report of the United States Geological Survey to the Secretary of the Interior, 1880-81.

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Image 12 of 160, The physical geology of the Grand Canyon District,

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