TY  - RPRT
TI  - Coal resource assessments in the northern and central Appalachian coal region
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1999
DO  - 10.3133/fs11599
UR  - https://pubs.usgs.gov/publication/fs11599
ID  - fs11599
ER  -