TY  - RPRT
TI  - Preliminary geologic map of the Bergen Park area, Jefferson and Clear Creek Counties, Colorado
AU  - Douglas M. Sheridan
AU  - John Calvin Reed
PY  - 1971
DO  - 10.3133/ofr71256
UR  - https://pubs.usgs.gov/publication/ofr71256
ID  - ofr71256
ER  -