TY - RPRT TI - Progress report on the stratigraphy of the Triassic and associated formations in part of the Colorado Plateau region AU - G.A. Williams AU - R. A. Cadigan AU - H. F. Albee AU - John H. Stewart PY - 1953 DO - 10.3133/tei313 UR - https://pubs.usgs.gov/publication/tei313 ID - tei313 ER -