Stratigraphic Sections of the Phosphoria Formation in Montana, 1949-50

by R. P. Sheldon, Vincent Ellis McKelvey, Arthur Earle Granger, Paul Livingston Applin, Roger Warren Swanson, Wilbur Nathaniel Palmquist, John William Harshbarger, Esther English Richards Applin, Francis Ramey Hall, Walter Scott West · 1949