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Citation Info Courtenay, F. letterer. Dahl, James, former owner. Egloffstein, F. W., 1824-1885, topographer. Floyd, John B. (John Buchanan), 1806-1863, orderer. Humphreys, A. A. (Andrew Atkinson), 1810-1883, director. Ives, J. C., explorer. Newberry, J. S. (John Strong), 1822-1892, geologist.. Sartain, Samuel, 1830-1906, ruler. United States. Office of Explorations and Surveys, director.. Geological Map No. 2; prepared by J. S. Newberry M.D. geologist to the expedition.; Rio Colorado of the West.;Explorations and Surveys, War Department, map no. 2.. [JPEG]. Retrieved from https://geo.nyu.edu/catalog/458fb173-e5ef-44be-9f5f-364923ee033f