TY  - RPRT
TI  - Coal geology and coal, oil, and gas resources of the Erie and Frederick quadrangles, Boulder and Weld counties, Colorado
AU  - Frank Darwyn Spencer
PY  - 1986
DO  - 10.3133/b1619
UR  - https://pubs.usgs.gov/publication/b1619
ID  - b1619
ER  -