TY  - RPRT
TI  - Preliminary geologic map of the Placerville quadrangle, Colorado
AU  - A.L. Bush
AU  - C. S. Bromfield
AU  - C. T. Pierson
PY  - 1956
DO  - 10.3133/tem777
UR  - https://pubs.usgs.gov/publication/tem777
ID  - tem777
ER  -