The Phosphoria, Park City and Shedhorn formations in the western phosphate field : geology of permian rocks in the western phosphate field - MacKelvey, Vincent Ellis; Williams, James Steele, 1896-1957; Sheldon, Richard P.; Cressman, Earle Rupert, 1923-; Cheney, T. M.; Swanson, R. W. (Washington : United States Government Printing Office, 1959)
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Keywords: regionální geologie; stratigrafie; fosfáty; perm; fosfor; regional geology; stratigraphy; permian; phosphorus; phosphates; Spojené státy americké (západní oblast); United States, Western; studie; studies