TY - RPRT TI - Coal resource occurrence and coal development potential maps of the Willow Crossing Quadrangle, Powder River and Rosebud counties, Montana AU - Colorado School of Mines Research Institute PY - 1979 DO - 10.3133/ofr79101 UR - https://pubs.usgs.gov/publication/ofr79101 ID - ofr79101 ER -