Compiled in the Bureau of Topographical Engineers of the War Department. Chiefly for Military purposes under the authority of Honorable J.B. Floyd, Secretary of War. Shows towns, wagon roads, explorers’ routes, railroads, forts, etc., approx. from Albuquerque, N.M. to Fort Lane, Or. and from Fort Laramie, Wyo. to Los Angeles, Calif. “Corrections and additions in reference to railroads in California, etc., were made in January, 1862.” The geographic region of Southwest is referred to as the New Southwest.