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Map of the principal air transport lines of the country
Color map of the United States with lines showing the different aviation routes with Chicago, Illinois, as the hub for this form of transportation.
25.4 x 36.8 cm
- still image
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (April 7,1929), Picture Section Part 1, p. 1