Raamatud Richard Porter Sheldon
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Progress Report on Investigations of Western Phosphate Deposits Geological Survey Circular, No. 297
R. W. SWANSON, V E McKelvey, Richard Porter Sheldon
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Stratigraphic Sections of the Phosphoria Formation in Wyoming, 1951 Geological Survey Circular, No. 324
T. M. CHENEY, Richard Porter Sheldon, R G Waring
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Geochemistry of Uranium in Phosphorites and Black Shales of the Phosphoria Formation Usgs Bulletin 1084-D
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Physical Stratigraphy of the Phosphoria Formation in Northwestern Wyoming Usgs Bulletin 1042-E
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