APA (7th ed.) Citation

Geological Survey (U.S.), Graymer, R. W., Jones, D. L., & Brabb, E. E. (1994). Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database. The Survey ; [USGS Information Services].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), R. W. Graymer, David Lawrence Jones, and Earl E. Brabb. Preliminary Geologic Map Emphasizing Bedrock Formations in Contra Costa County, California: A Digital Database. [Menlo Park, CA] : [Denver, CO]: The Survey ; [USGS Information Services], 1994.

MLA (8th ed.) Citation

Geological Survey (U.S.), et al. Preliminary Geologic Map Emphasizing Bedrock Formations in Contra Costa County, California: A Digital Database. The Survey ; [USGS Information Services], 1994.