TY  - RPRT
TI  - Coal-A complex natural resource: An overview of factors affecting coal quality and use in the United States With a contribution on coal quality and public health
AU  - Stanley P. Schweinfurth
AU  - Robert B. Finkelman
PY  - 2003
DO  - 10.3133/cir1143
UR  - https://pubs.usgs.gov/publication/cir1143
ID  - cir1143
ER  -