TY  - RPRT
TI  - A critical review of published coal quality data from the southwestern part of the Powder River Basin, Wyoming
AU  - James A. Luppens
PY  - 2011
DO  - 10.3133/ofr20111148
UR  - https://pubs.usgs.gov/publication/ofr20111148
ID  - ofr20111148
ER  -