This map depicts the corridor for flight navigation between Uniontown and Pittsburgh, Pennsylvania, and Cleveland, Ohio, and Mount Clemens,... Show moreThis map depicts the corridor for flight navigation between Uniontown and Pittsburgh, Pennsylvania, and Cleveland, Ohio, and Mount Clemens, Michigan, including major urban areas, roads, railroads, etc., and the location of airfields, sea-plane landings, and navigation beacons. It was compiled and produced by the Engineer Reproduction Plant, U.S. Army, Washington D.C. under the direction of the Information Division, Office of Chief of Air Corps in 1931, revised in 1932. Show less