The Phosphoria, Park City and Shedhorn formations in the western phosphate field : geology of permian rocks in the western phosphate field /

Autor MacKelvey, Vincent Ellis, Williams, James Steele, 1896-1957, Sheldon, Richard P., Cressman, Earle Rupert, 1923-, Cheney, T. M., Swanson, R. W.
Vydáno 1959