The Online Archive of California (OAC) provides free public access to detailed descriptions of primary resource collections maintained by more than 200 contributing institutions and the 10 University of California (UC) campuses. OAC’s contains over 20,000 online collection guides. You can use these to browse, locate resources, or view selected items digitally — the OAC contains more than 220,000 digital images and documents — or learn how you can gain access to the physical objects.