TY  - RPRT
TI  - Exploratory drilling in the McCallum coal field, Jackson County, Colorado, August-November 1977
AU  - Dawn H. Madden
PY  - 1977
DO  - 10.3133/ofr77888
UR  - https://pubs.usgs.gov/publication/ofr77888
ID  - ofr77888
ER  -