Metropolitan region of Chicago, per cent of population white of native parentage, by townships, 1930 :by sectors and zones in Chicago /map prepared by Richard O. Lang.
Scale approximately 1:1,000,000; Master and use copy. Digital master created according to Benchmark for Faithful Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
University of Chicago. Social Science Research Committee