The mission of the Sonoma Valley Historical Society is to provide a forum and a resource for the study and dissemination of Sonoma Valley history for present and future generations by identifying, collecting, preserving and sharing artifacts, documents and images.
The Sonoma Valley Historical Society's digital collection at California Revealed consists of texts and photographs from the 1890s to 2000s. The collection includes an extensive run of issues of the Sonoma Valley Expositor and the Sonoma News newspapers.