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Longest super in U. S. - 160 miles : on the relief map of Pennsylvania
Map of Pennsylvania between Pittsburgh and Harrisburg demonstrates the location of a toll road through the Allegheny Mountains.
7.4 x 15.8 cm
black and white
- 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 (November 5, 1939), Automobiles, p. 9