TY  - RPRT
TI  - The National Coal Resources Data System: A status report
AU  - M. Devereaux Carter
AU  - Antoinette L. Medlin
AU  - Kathleen K. Krohn
PY  - 1981
DO  - 10.1130/0016-7606(1981)92<563:tncrds>2.0.co;2
UR  - https://pubs.usgs.gov/publication/70188934
ID  - 70188934
ER  -