The University of Chicago Map Library has worked diligently to digitize hundreds of their unique and rare maps in the past few years. Their holdings of maps that document the history of Chicago is quite strong, and this collection casts its gaze in that direction. These maps were generated by a number of government agencies, including the Chicago Zoning Commission, the Chicago Plan Commission, the Chicago Regional Planning Association, and the U.S. Geological Survey in the 1920s, 1930s, and 1940s. There are over two dozen maps here, including detailed maps of the Sanitary District of Chicago, annexation maps, and mortgage risk maps compiled by the Chicago Housing Authority. Many of the maps are fascinating, particularly the 1946 map that presents a "generalized presentation of the physical elements of the city plan designed for a population of 3,800,000 by 1965."
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