The Campbell Museums collection contains texts from the late 1800s to the 1950s. The collection consists of newspaper publications including most issues of the Campbell (Interurban) Press and other publications such as Campbell Weekly Visitor.
The Hoover Institution Archives, Stanford University collection contains audiovisual material (moving images, audio) from the 1920s to the 1990s. The majority of the collection consists of political election content and includes Ronald Reagan presidential campaign TV advertisements.
The Huntington Library collection contains images and audiovisual material (moving images and audio) from the 1900s to 2000s. A majority of the collection consists of film, oral history, and recorded interviews concerning working class history and the politics of Los Angeles County and surrounding areas.
The Ontario City Library collection contains audiovisual material (moving images, audio) and still images from the mid 1890s to the mid 1990s. The majority of the collection consists of oral histories and include subjects and topics such as automobiles, John S. Armstrong, the Long Beach Earthquake of 1933, Chaffey College, and more.