TY  - RPRT
TI  - Isopach maps of overburden on the Pittsburgh coal bed in southwestern Pennsylvania and northern West Virginia
AU  - Bion H. Kent
PY  - 1974
DO  - 10.3133/ofr74132
UR  - https://pubs.usgs.gov/publication/ofr74132
ID  - ofr74132
ER  -