Sanborn Maps at the Library of Congress (free and public access, no login required) Access remotely with a Cal Poly account or on library computers/using campus wifi on your own laptop. ProQuest Digital Sanborn Maps (Cal Poly Login Required)Ĭal Poly holds a subscription to digital access of California Sanborn Maps. Since they contain detailed information about properties and individual buildings, Sanborn maps are invaluable for documenting the changes in the built environment of American cities over many decades. The maps were originally created to allow fire insurance companies to assess their total liability in urbanized areas of the U.S. cities and towns in the 19th and 20th centuries. The Sanborn Map Company was a publisher of detailed maps of U.S. Sanborn Fire Insurance Maps are a valuable resource for local history.
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