TY  - RPRT
TI  - National Coal Quality Inventory (NaCQI) and U.S. Geological Survey Coal Quality Databases
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1999
DO  - 10.3133/fs12099
UR  - https://pubs.usgs.gov/publication/fs12099
ID  - fs12099
ER  -