Blake, W.P., 1856, General report upon the geological collections, from Whipple, A.W., with Ives, J.C. [1853-1854], Report of explorations for a railway route, near the thirty-fifth parallel of north latitude, from the Mississippi River to the Pacific Ocean, in Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean. Made under the direction of the Secretary of War, in 1853-4...: U.S. Congress, 33rd, 2nd Session, House Executive Document 91, Senate Executive Document 78, v. 3, Part 4, p. 1-119, map.