The focus of the archival collection is on Wilmington from the early 1900s through the early 2000s. This includes Wilmington’s role in World War I and World War II, its institutions and businesses, the formation of the City, as well as the people and events of its more recent past. Because of the extensive acreage of the original town of Wilmington, materials on the early history of neighboring…

The Homestead Museum collection includes a diverse array of items from Los Angeles and the Los Angeles Region covering the general period of 1830 to 1930 and includes ephemera, maps, photographs, printed works, and three-dimensional everyday artifacts. The Homestead Museum is a participant in the LAAS and ONE Archives Hidden Histories project.

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.