TY - RPRT TI - Structure, coal thickness, and overburden thickness of the Wall Coal Resource Unit, west half of the Birney 30' x 60' Quadrangle, Big Horn and Rosebud counties, Montana AU - William C. Culbertson AU - Herb I. Saperstone PY - 1987 DO - 10.3133/coal111 UR - https://pubs.usgs.gov/publication/coal111 ID - coal111 ER -