The collection includes photographs of the Rockhaven Sanitarium property as well as some of the residents and employees from over the decades. Also includes written memories from people who worked there or had relatives cared for at the Sanitarium.

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.