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 Sonoma County Library collection contains text and audiovisual material (moving images and audio) from the 1940s to 1990s. A majority of the collection consists of film concerning politics and recreation in Sonoma County. Subjects also include news clippings documenting Sonoma County citizens and their involvement in World War II.
The Whittier Museum collection contains audiovisual materials (moving images and audio) from the 1900s to 2000s. A majority of the collection consists of oral history interviews with residents of Whittier, California. Subjects include westward expansion and settlement of California.