Map of the Great Salt Lake and adjacent country in the Territory of Utah ; Surveyed 1849 and 1850 under the orders of Col. J.J. Abert ; Drawn by Lieut. Gunnison and Charles Preus.
The Simpson report is one of the first thorough surveys in New Mexico. Related to it are the many handsome plates, as well as one of the maps. The other map shows the routes across Texas.