This map depicts the corridor for flight navigation between Cheyenne, Wyoming, and Rock Springs, Wyoming, including major urban areas, roads,... Show moreThis map depicts the corridor for flight navigation between Cheyenne, Wyoming, and Rock Springs, Wyoming, including major urban areas, roads, railroads, etc., and the location of airfields 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 Chief of Air Corps in 1928, and revised in 1932. Show less