Map of the United States and their territories between the Mississippi and the Pacific Ocean, and of part of Mexico / compiled in the Bureau of the Corps of Topogl. Engs. under a resolution of the U.S. Senate, from the best authorities which could be obtaUnited States. Army. Corps of Topographical Engineers1850 [i.e. 1851]Date on map is 1850, however Wheat writes " ... ostensibly published in 1850, though it could not have gone to the engravers, Sherman and Smith of New York, until early in 1851" (Mapping the transmississippi West, 696).On 2 sheets (each 62 x 105 cm.) and mounted on linen.Relief shown by hachures.cartographic