TY  - RPRT
TI  - Maps showing the extent of mining, locations of mine shafts, adits, air shafts, and bedrock faults, and thickness of overburden above abandoned coal mines in the Boulder-Weld coal field, Boulder, Weld, and Adams Counties, Colorado
AU  - S. B. Roberts
AU  - J. L. Hynes
AU  - C. L. Woodward
PY  - 2001
DO  - 10.3133/i2735
UR  - https://pubs.usgs.gov/publication/i2735
ID  - i2735
ER  -