TY  - RPRT
TI  - Facies development in the Lower Freeport coal bed, west-central Pennsylvania, U.S.A.
AU  - B.S. Pierce
AU  - R.W. Stanton
AU  - C.F. Eble
PY  - 1991
DO  - 10.1016/0166-5162(91)90042-h
UR  - https://pubs.usgs.gov/publication/70016654
ID  - 70016654
ER  -