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.

Captain Pope, then serving with the Corps of Topographical Engineers, led an expedition that roamed the unsettled western part of Minnesota Territory from June 6 to September 27, 1849.

Letter from the Secretary of War, Transmitting the report of Lieutenant Mullan, in charge of the construction of the military road from Fort Benton to Fort Walla-Walla.