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mods: Stratigraphic sections of the Phosphoria Formation in Wyoming, 1949-50 Sheldon, Richard Porter 1923- creator author. Geological Survey (U.S.) issuing body. U.S. Atomic Energy Commission text bibliography dcu 1953 monographic eng remote 1 online resource (45 pages) : illustrations, map. by R.P. Sheldon [and three others]. Title from title screen (viewed July 22,2015). "This report concerns work done on behalf of the U.S. Atomic Energy Commission and is published with the permission of the Commission." Includes bibliographical references (page 4). n-us-wy Phosphoria Formation Geology, Stratigraphic Permian Phosphate rock Wyoming Geology, Stratigraphic Permian Geologic Period Phosphate rock Wyoming From 230 to 280 million years ago fast I 19.4/2:307 I 19.4/2:307 Stratigraphic sections of the Phosphoria Formation in Wyoming, 1949-50 Sheldon, Richard Porter, 1923-. (OCoLC)5043122 Geological Survey circular ; 307 https://purl.fdlp.gov/GPO/gpo110460 COP 160708 20190117084559.0 in00004033388 eng