TY  - RPRT
TI  - Geologic processes affecting the quality of the Upper Freeport coal bed, west-central Pennsylvania
AU  - R.W. Stanton
AU  - C. B. Cecil
AU  - B.S. Pierce
AU  - L.F. Ruppert
AU  - F.T. Dulong
PY  - 1986
DO  - 10.3133/ofr86173
UR  - https://pubs.usgs.gov/publication/ofr86173
ID  - ofr86173
ER  -