This map depicts the corridor for flight navigation between Dayton, Ohio, and Mount Clemens, Michigan, including major urban areas, roads,... Show moreThis map depicts the corridor for flight navigation between Dayton, 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, Corps of Engineers under the direction of the Airways Section, Office Chief of Air Corps in 1925. Show less