TY  - RPRT
TI  - Preliminary geologic map of the Walnut Creek Quadrangle, Contra Costa County, California
AU  - T. W. Dibblee
PY  - 1980
DO  - 10.3133/ofr80351
UR  - https://pubs.usgs.gov/publication/ofr80351
ID  - ofr80351
ER  -