TY  - RPRT
TI  - Geologic map showing total thickness of coal in the north half of the Powder River basin, southeastern Montana and northeastern Wyoming
AU  - N.M. Denson
AU  - B.L. Crysdale
PY  - 1991
DO  - 10.3133/i2131a
UR  - https://pubs.usgs.gov/publication/i2131A
ID  - i2131A
ER  -