This collection offers a selection of historical Sonoma County maps held by the Sonoma County Library. It includes township maps, plat maps and more

The Sonoma County Architectural Drawing and Plans Collection incudes renderings, blueprints and sketches from prominent Sonoma County architects, drawn from the collections of the Sonoma County Library. 

The Advertising and Marketing Collection includes materials associated with advertisements for Sonoma Counthy businesses, tourism, political campaigns, events and organizations featured in newspapers and other sources.

The Sonoma County Historical Newspaper Collection includes a selection of pages from Sonoma County newspapers. The collection includes clippings as well as entire pages, but does not yet include entire issues.

The Sonoma County Library Postcard Collection includes both commercial and real-photo postcards, most from the 1890s through the 1930s. While the majority of postcards depict Sonoma County scenes and businesses, the collection also includes a significant number of postcards depicting the destruction in San Francisco wrought by the 1906 earthquake.