TY  - RPRT
TI  - Map showing areal extent of the Pittsburgh Coal Bed and horizon and mined areas of the Pittsburgh Coal Bed in Pennsylvania, Ohio, West Virginia, and Maryland
AU  - Leslie F. Ruppert
AU  - S.J. Tewalt
AU  - L. J. Bragg
AU  - John Tully
AU  - J. Pierce
AU  - A. Weller
AU  - Jeanette Yarnell
PY  - 1996
DO  - 10.3133/ofr96280
UR  - https://pubs.usgs.gov/publication/ofr96280
ID  - ofr96280
ER  -