About the OAC

A core component of the California Digital Library, the Online Archive of California (OAC) is a digital information resource that facilitates and provides access to materials such as manuscripts, photographs, and works of art held in libraries, museums, archives, and other institutions across California. The OAC is available to a broad spectrum of users -students, teachers, and researchers of all levels. Through the OAC, all have access to information previously available only to scholars who traveled to collection sites.

The OAC includes a single, searchable database of "finding aids" to primary sources and their digital facsimiles. Primary sources include letters, diaries, manuscripts, legal and financial records, photographs and other pictorial items, maps, architectural and engineering records, artwork, scientific logbooks, electronic records, sound recordings, oral histories artifacts and ephemera.

Describing primary sources in detail, finding aids are the guides and inventories to collections held in archives, museums, libraries and historical societies. Finding aids provide detailed descriptions of collections, their intellectual organization and, at varying levels of analysis, of individual items in the collections. Access to the finding aid is essential for understanding the true content of a collection and for determining whether it is likely to satisfy your research needs.