TY  - RPRT
TI  - Coal-bearing Upper Pennsylvanian and Lower Permian rocks, Washington area, Pennsylvania
AU  - Henry L. Berryhill
AU  - Stanley P. Schweinfurth
AU  - Bion H. Kent
PY  - 1971
DO  - 10.3133/pp621
UR  - https://pubs.usgs.gov/publication/pp621
ID  - pp621
ER  -