Map of routes for a Pacific railroad : compiled to accompany the report of the Hon. Jefferson Davis, Sec. of War, in Office of P.R.R. Surveys, 1855 /

[Washington, D.C.] : [U.S. Army Corps of Engineers], 1975

Western territories : sheet no. 3 /

by Gillespie, G. L.
[Washington, D.C.] : U.S. Army Corps of Engineers, 1975

Map of Oregon and upper California from the surveys of John Charles Fremont and other authorities /

by Frémont, John Charles, 1813-1890
[Washington] : U.S. Army, Corps of Engineers, 1975