TY  - RPRT
TI  - Quality of economically extractable coal beds in the Gillette coal field as compared with other Tertiary coal beds in the Powder River basin, Wyoming and Montana
AU  - Margaret S. Ellis
PY  - 2002
DO  - 10.3133/ofr02174
UR  - https://pubs.usgs.gov/publication/ofr02174
ID  - ofr02174
ER  -