Richard Porter Sheldon

Progress Report on Investigations of Western Phosphate Deposits

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Geochemistry of Uranium in Phosphorites and Black Shales of the Phosphoria Formation

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Estimates of Undiscovered Petroleum Resources

A Perspective

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Lithium Anomaly Near Pringle, Southern Black Hills, South Dakota, Possibly Caused by Unexposed Rare-mineral Pegmatite

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Physical Stratigraphy of the Phosphoria Formation in Northwestern Wyoming

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Phosphate-rock Resources of the United States

An analysis of phosphate-rock resources, based on past estimates and all available recent information, indicates that sufficient phosphate exists in t...

The Phosphoria, Park City and Shedhorn Formations in the Western Phosphate Field

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Progress Report on Investigations of Western Phosphate Deposits

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Geochemistry of Uranium in phosphorites and black shales of the Phosphoria formation

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Search for and Development of Undiscovered Phosphate Resources in Southeast Asia

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Progress Report on Investigations of Western Phosphate Deposits

Geological Survey Circular

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Assessment of Undiscovered Conventionally Recoverable Petroleum Resources of the Arabian-Iranian Basin

By Charles D. Masters, H. Douglas Klemme, and Anny B. Coury

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Phosphate-rock Resources of the United States

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