Exploration and Settlement 1850–1890

U.S. Dept. of the Interior, Geological Survey, Exploration and Settlement 1850-1890, in: The National Atlas of the United States of America (Arch C. Gerlach, editor). Washington, D.C.: U.S. Dept. of the Interior, Geological Survey, 1970. Source: Perry-Castañeda Library Map Collection. Courtesy of the University of Texas Libraries, The University of Texas at Austin. http://www.lib.utexas.edu/maps/united_states/exploration_1850.jpg, public domain.

U.S. Dept. of the Interior, Geological Survey, Exploration and Settlement 1850–1890, in: Arch C. Gerlach (ed.), The National Atlas of the United States of America, Washington, D.C. 1970; source: Perry-Castañeda Library Map Collection, courtesy of the University of Texas Libraries, The University of Texas at Austin, public domain.