Contra Costa County Historical Society [CA]
The Contra Costa County Historical Society is dedicated to preserving the history of Contra Costa County and Martinez, California, in particular. The society runs a local history museum, the Contra Costa County History Center. The center is open to the public by appointment, and offers exhibits on Contra Costa County. Prospective visitors should check the website to check what exhibits are currently up.
The website offers visitor information, a collection of articles on local history, an extensive collection of historic photographs, and an events calendar.