The Museum Archives documents the history of the Los Angeles County Museum from its founding in 1910 to the present. The collection includes photographs, departmental papers, research papers, ephemera, publication, architectural plans, newspaper clippings and original artwork.

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.