TY  - RPRT
TI  - Jointing in outcropping rocks of Pennsylvanian age, central Greater Pittsburgh region, Pennsylvania
AU  - William R. Kohl
PY  - 1980
DO  - 10.3133/ofr8023
UR  - https://pubs.usgs.gov/publication/ofr8023
ID  - ofr8023
ER  -