TY  - RPRT
TI  - Carbonera coal geophysical logging research holes; core descriptions and coal analysis
AU  - R.G. Hobbs
AU  - J. L. Gualtieri
AU  - R.N. Babcock
PY  - 1982
DO  - 10.3133/ofr82827
UR  - https://pubs.usgs.gov/publication/ofr82827
ID  - ofr82827
ER  -