U.S. Pacific Rail Road Exp. & Survey, War Department. Geological Map of the Route explored by Lieut. A. W. Whipple, Corps of Topl. Engrs., near the parallel of 35 degrees north latitude from the Mississippi River to the Pacific Ocean, 1853-1854. Prepared in the Office of the Pacific Rail Road exploration & Survey War Department from the notes and collections of the geologist of the expedition, Mr. Jules Marcou by William P. Blake, 1854
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