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Map of the principal air transport lines of the country
A map of aviation routes in the United States. The map indicates that many aviation routes begin, end, or go through Chicago, Illinois.
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