This map depicts the corridor for flight navigation between Iowa City, Iowa, and Omaha, Nebraska, including major urban areas, roads, railroads,... Show moreThis map depicts the corridor for flight navigation between Iowa City, Iowa, and Omaha, Nebraska, including major urban areas, roads, railroads, etc., and the location of airfields and navigation beacons. It was compiled and produced by the Topographic Branch, U.S. Geological Survey under the direction of the Airways Section, Office Chief of the Air Corps in 1930. Show less