Collection dates prior to separation from Los Angeles County (1889)to present. Bulk of collection dates from 1889 to 1953 and is Orange County specific.

The Orange County Historical Society (OCHS) is a non-profit group which collects, preserves and shares the history of Orange County, California for the benefit of its members and the general public.

The Yosemite Archives contain historical records and manuscripts related to Yosemite's history, including the donated papers of ethnographers and scientists, resource management records, historic park administrative records, and slide, photo, and film collections.