TY  - RPRT
TI  - Origin of thick Lower Tertiary coal beds in the Powder River Basin, Wyoming and Montana— Some paleogeographic constraints
AU  - David A. Seeland
PY  - 1993
DO  - 10.3133/b1917q
UR  - https://pubs.usgs.gov/publication/b1917Q
ID  - b1917Q
ER  -