TY  - RPRT
TI  - Coal assessments and coal research in the Appalachian basin
AU  - Susan J. Tewalt
AU  - Leslie F. Ruppert
PY  - 2014
DO  - 10.3133/pp1708d.4
UR  - https://pubs.usgs.gov/publication/pp1708D.4
ID  - pp1708D.4
ER  -