Insurance maps of Newark, New Jersey, Vol. 4 (New York: Sanborn Map Company, 1931), from the Littman Library Rare Book collection, has been digitized and is now available in the DANA maps collection at http://archlib.njit.edu/collections/dana/collections/maps/sanborn-v4/index.php . The rest of the Sanborn map volumes from 1931 will be posted online as the scanning of each is completed.
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