TY  - RPRT
TI  - Exploratory drilling during 1979 in the McCallum coal field, Jackson County, Colorado
AU  - Thomas J. Piccirilli
PY  - 1979
DO  - 10.3133/ofr791629
UR  - https://pubs.usgs.gov/publication/ofr791629
ID  - ofr791629
ER  -