Map drawn to accompany reports of explorations for a Pacific railroad route, depicting the U.S. territory west of the Mississippi. Includes Indian tribal locations, military posts, and routes and dates of expeditions and surveys through May 1, 1857. "Complied from authorized explorations and other reliable data." Map includes a list of the sources of this data. Engraved by Selmar Siebert. Published in 1859.
Master Tiff: 24 bit color, 200 ppi, 100% in size; Access Jpeg: 24 bit color, 150 ppi, 600 pixels across long dimension; Thumb Jpeg: 24 bit color, 72 dpi, 150 pixels across long dimension.
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