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Wilkins, T.  King, Clarence Rivers (1842-1901), geologist and first director of the U.S. Geological Survey (USGS). American National Biography. Retrieved 8 Dec. 2022, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1300913.