United States. Army. Air ServiceShows government or Army landing fields, Navy or Marine landing fields, aerial mail landing fields, municipal landing fields, commercial landing fields, emergency or unimproved landing fields, seaplane landing sites, and the routes of the proposed airway system.; Includes index of 76 landing fields.; "14583."; "4894."on sheet 76 x 112 centimetersJPEGUMN_ALMA:9952820380001701engArmy Air Service (Washington, D.C)PublicLanding facilities and proposed airway system in the United States, 1924MapsUnited StatesUniversity of Minnesota