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9 document boxes, 5 microfilms, 1 index
18 boxes, 8 card-file drawers, 5 spiral-bound books, 3 books, and 3 binders
31 boxes, 18 cu feet
Contra Costa County Historical Society
The Contra Costa County Historical Society collection contains print materials from the 1870s through the 1900s. The majority of the collection consists of accessors maps, and include subjects and topics such as Contra Costa land owners, plat maps and more.