TY  - RPRT
TI  - Joint patterns in coal, black shale, gray shale and mudrock, and limestone and dolomite in the Appalachian Basin
AU  - George Willis Colton
AU  - W. J. Perry
AU  - Jean D. MacKenzie
PY  - 1981
DO  - 10.3133/ofr81837
UR  - https://pubs.usgs.gov/publication/ofr81837
ID  - ofr81837
ER  -