Estimates of Undiscovered Petroleum Resources: A Perspective

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

Physical Stratigraphy of the Phosphoria Formation in Northwestern Wyoming

Report on the Marine Phosphatic Sediments Workshop: February 9-11, 1979, Honolulu, Hawaii U.S.A.

Phosphate-rock Resources of the United States: Volume 888

Progress Report on Investigations of Western Phosphate Deposits

Stratigraphic Sections of the Phosphoria Formation: 1953 and 1954

Lithium Anomaly Near Pringle, Southern Black Hills, South Dakota, Possibly Caused by Unexposed Rare-mineral Pegmatite: Issues 885-889