TY  - RPRT
TI  - Petroleum exploration plays and resource estimates, 1989, onshore United States; Region 4, Rocky Mountains and Northern Great Plains
AU  - R. B. Powers
PY  - 1993
DO  - 10.3133/ofr93337
UR  - https://pubs.usgs.gov/publication/ofr93337
ID  - ofr93337
ER  -