TY  - RPRT
TI  - Coal quality: Global priorities
AU  - Brenda S. Pierce
AU  - Kristin O. Dennen
AU  - Robert B. Finkelman
PY  - 2004
DO  - 10.3133/cir1272
UR  - https://pubs.usgs.gov/publication/cir1272
ID  - cir1272
ER  -