This map depicts the corridor for flight navigation between Milwaukee, Wisconsin, and St. Paul and Minneapolis, Minnesota, including major urban... Show moreThis map depicts the corridor for flight navigation between Milwaukee, Wisconsin, and St. Paul and Minneapolis, Minnesota, including major urban areas, roads, railroads, etc., and the location of airfields, seaplane anchorages, and navigation beacons. It was compiled and printed for the Aeronautics Branch of the Department of Commerce by the Coast and Geodetic Survey, Washington D.C., in January 1930. Show less