Physical stratigraphy and mineral resources of Permian rocks in western Wyoming Sheldon, Richard Porter 1923- creator author. Geological Survey (U.S.) issuing body. U.S. Atomic Energy Commission sponsoring body. text bibliography Maps. dcu 1963 monographic eng remote 1 online resource (233 unnumbered pages) : illustrations, maps + 9 plates. by Richard P. Sheldon; prepared on behalf of the U.S. Atomic Energy Commission. Title from title screen (viewed September 26, 2014). "Geology of Permian rocks in the western phosphate field." Includes bibliographical references (pages 267-269) and index. n-us-wy Geology Wyoming Geology, Stratigraphic Permian Geology Geology, Stratigraphic Permian Geologic Period Wyoming From 230 to 280 million years ago fast I 19.16:313-B I 19.16:313-B Physical stratigraphy and mineral resources of Permian rocks in western Wyoming Sheldon, Richard Porter, 18923-. (OCoLC)3343989 Geological Survey professional paper ; 313-B https://purl.fdlp.gov/GPO/gpo85360 COP 140929 20211120182624.0 in00003903004 eng