Air Navigation Map No. 20 (Experimental), 1932

This map depicts the corridor for flight navigation between Bellefonte, Pennsylvania, and Cleveland, Ohio, including major urban areas, roads, railroads, etc., and the location of airfields, and navigation beacons. It was compiled and produced by the Information Division, Office of Chief of Air Corps, at the Engineer Reproduction Plant, U.S. Army, Washington D.C. in 1930, and revised in 1932.