TY  - RPRT
TI  - Geologic map of the Oak Forest Quadrangle and part of the Blacksville Quadrangle, southwestern Pennsylvania
AU  - J.B. Roen
PY  - 1972
DO  - 10.3133/i699
UR  - https://pubs.usgs.gov/publication/i699
ID  - i699
ER  -