TY - RPRT TI - Structure, coal thickness, and overburden thickness of the Knobloch coal resource unit, Birney area, Big Horn, Rosebud, and Powder River Counties, Montana AU - William C. Culbertson AU - Herb I. Saperstone PY - 1987 DO - 10.3133/coal112 UR - https://pubs.usgs.gov/publication/coal112 ID - coal112 ER -