TY  - RPRT
TI  - U.S. Geological Survey coal resource assessment
AU  - S.S. Crowley
AU  - John R. SanFilipo
AU  - Peter D. Warwick
AU  - S.J. Law
AU  - Claire E. Aubourg
PY  - 1999
UR  - https://pubs.usgs.gov/publication/70195484
ID  - 70195484
ER  -