TY  - RPRT
TI  - Geologic map of the Monongahela quadrangle, southwestern Pennsylvania
AU  - John B. Roen
AU  - Bion H. Kent
AU  - Stanley P. Schweinfurth
PY  - 1968
DO  - 10.3133/gq743
UR  - https://pubs.usgs.gov/publication/gq743
ID  - gq743
ER  -