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www.loc.gov/item/prn-17-074: "The Library of Congress has placed online nearly 25,000 Sanborn Fire Insurance Maps, which depict the structure and use of buildings in U.S. cities and towns. Maps will be added monthly until 2020, for a total of approximately 500,000."Website: www.loc.gov/collections/sanborn-maps/about-this-collection/en.wikipedia.org/wiki/Sanborn_Maps: "Daniel Alfred Sanborn, a civil engineer and surveyor, began working on fire insurance maps in 1866."