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​​​​​​​​​​​​​​California Geological Survey Library ​​

CGS Library ​​CGS Library hours of operation:

Monday, ​Tuesday, Wednesday, and Thursday.​
​​9:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:00 p.m.​
The Library is closed on Fridays.​​​

​Please note these changes in Library hours:​​​
  • June 12: open 1:00 p.m. to 4:00 p.m.
  • June 13: c​losed​
  • June 14: ​open 1:00 p.m. to 4:00 p.m.​​
  • ​June 15: ​open 1:00 p.m. to 4:00 p.m.​​
​​​​​For information about how to order CGS publications, please ​click here. ​​​ ​ ​

​CGS has a new website for searching historic documents, including the entire collection of California Geology.  The CGS Digital Archive is a portal to historic images, texts, and maps detailing the mining and geologic history of California and the West. Click here to enter the CGS Digital Archive.

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Library or reference questions: 916-327-1850

801 K Street, 14th Floor (or MS 14-34 for address)
Sacramento, CA 95814-3532

Under several different names, the California Geological Survey Library has been in existence since 1880 and has developed into an extensive collection of scientific and technical materials on Earthquakes, Engineering Geology, Environmental Geology, Geology of California, Geomorphology, Groundwater, Hydrogeology, Landslides, Mapping, Mined Land Reclamation, Mineral Resources, Mining, Seismology, Soil Mineralogy, Structural Geology, Tectonics, Water Resources and Volcanology.

The Library has over 100,000 books and reports, including CGS publications, various map collections, photographs, U.S. Geological Survey publications and periodicals. To see some of our historical gold mining photographs, click here. To see a sample of photos of California minerals and mines click here. CGS now also has the California Geology Magazine in an online searchable database.

The Library is open to the public for reference and research. Materials may be borrowed through interlibrary loan only.

The Library is a designated State Earth Science Information Center (ESIC), under an agreement with the U.S. Geological Survey, tasked to respond to requests for earth science information.

To purchase CGS publications click here.
CGS publications are also available for reference at our Bay Area and Los Angeles offices. All of our publications, including those no longer available for purchase, may be viewed at the following libraries:
California State Library; California State Universities, Chico, Long Beach, San Diego; Fresno County Free Library; Los Angeles Public Library; San Diego Public Library; San Francisco Public Library; Stanford University; University of California, Berkeley, Davis, Los Angeles, San Diego and Santa Barbara.​