TY  - RPRT
TI  - Geologic map of the Powder River Basin and surrounding area, Wyoming, Montana, South Dakota, North Dakota, and Nebraska
AU  - M.S. Ellis
PY  - 1989
DO  - 10.3133/mf2095
UR  - https://pubs.usgs.gov/publication/mf2095
ID  - mf2095
ER  -