TY  - RPRT
TI  - U.S. Geological Survey coal exploratory drill program; utilization of samples from a typical drill-core
AU  - Gary B. Schneider
PY  - 1978
DO  - 10.3133/ofr78344
UR  - https://pubs.usgs.gov/publication/ofr78344
ID  - ofr78344
ER  -