The Library has a large collection of manuscripts, printed books and periodicals, photographs, maps and ephemera relating to Los Angeles.

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.

Special Collections and Archives houses the UC Irvine Libraries' collections of rare books, manuscripts, archives, photographs, and other rare and special materials. Major collections include the Critical Theory Archive, the Southeast Asian Archive, and the University Archives, as well as in-depth collections on Orange County and California history, dance and performing arts, 20th-century…

The Water Resources Center Archives (WRCA) is a unique library that collects archival materials on all aspects of water resources in California and the West. WRCA manages over 125 collections with several significant collections that pertain to water development in southern California. These collections include Franks Adams, Harry F. Blaney, John D. Galloway, Walter L. Huber, Oman J. Lillevang,…