TY  - RPRT
TI  - Geologic map showing total thickness of coal in the south half of the Powder River basin, northeastern Wyoming
AU  - N.M. Denson
AU  - B.L. Crysdale
PY  - 1991
DO  - 10.3133/i2131b
UR  - https://pubs.usgs.gov/publication/i2131B
ID  - i2131B
ER  -