Principal railway facilities in central Chicago /[Harold M. Mayer]; base map by Chicago Land Use Survey.
Figure 6. Also appeared in author's Ph. D. dissertation (University of Chicago, 1943): The railway pattern of metropolitan Chicago.; Scale [ca. 1:18,000]; Master and use copy. Digital master created according to Benchmark for Faithful Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.