The Japanese American National Museum holds a wide variety of materials documenting the Japanese American experience from a Japanese American perspective. Built around broad historical eras and themes of Japanese American experience, the holdings are used to fulfill the museum’s mission "to promote understanding and appreciation of America's ethnic and cultural diversity by sharing the Japanese…

The June L. Mazer Lesbian Collection, formerly the West Coast Lesbian Collections, was founded in Oakland, California, in 1981. Six years later it was moved to Los Angeles by Connexxus Women's Center/Centro de Mujeres, and it acquired its present name in 1987 after the death of June L. Mazer, a community activist and an invaluable supporter of the collection.

Collections include pamphlets and ephemera documenting the growth, industries, transportation, and social organizations of Los Angeles and greater southern California; photograph collections; thousands of books related to southern California; and numerous archival collections related to indiviuals, the citrus industry, and businesses in the Inland Empire.