TY - RPRT TI - Assessment of coal geology, resources, and reserves in the Southwestern Powder River Basin, Wyoming AU - Lee M. Osmonson AU - David C. Scott AU - Jon E. Haacke AU - James A. Luppens AU - Paul E. Pierce PY - 2011 DO - 10.3133/ofr20111134 UR - https://pubs.usgs.gov/publication/ofr20111134 ID - ofr20111134 ER -