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Stansbury's important exploration of the Great Salt Lake Basin and his report on the newly established Mormon settlements, as well as the routes and passes through the Rockies for emigrants and possibly a railroad. Wheat describes Stansbury's explorations in detail, and says his Map of the Great Salt Lake permanently established the topography and many of the place names of northwestern Utah. Wagner-Camp notes "59 plates listed on pp. [11]-12," but there are actually 58 listed, and one of these is the map by Lahontan. The present copy lacks one plate, Part of Western Slope of Promontory Range, but other than that they correspond exactly to the list, and furthermore it should be noted that the impressions of the plates in both of the Philadelphia, 1852, editions are markedly superior to the Washington, 1853 reprint, which is much more common. The first Philadelphia edition is titled An Expedition to the Valley of the Great Salt Lake...; the present edition has the heading at top of the title-page, "Special Session, March 1851, Senate Executive No. 3." Field 1940; Graff 3947; Howes S884; Sabin 90372; Wagner-Camp 219:2; Wheat, Transmississippi 3, Maps 764-5.