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1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
Additional title page description: Regional stratigraphic studies and ammonite zonation are used in interpreting complex intertonguing and subtle facies changes in rocks of Late Cretaceous and early Tertiary age.
A petrographic and stratigraphic study of the Fox Hills Sandstone interpreting provenance, depositional environment, and diagenesis.
Surface and subsurface data of an area along the eastern margin of the Idaho-Wyoming thrust belt establish the geometry and times of movement of two major frontal thrust faults.