Digital Maps and Geospatial Data | Princeton University
International air routes of United States carriers: September 30, 1955
- [Washington, D.C.] : [s.n.], 1955.
- United States. Civil Aeronautics Board. Bureau of Air Operations, Routes and Carriers Relations Division. North Decimal Degree 90.000000. South Decimal Degree -90.0000. East Decimal Degree 180.0000. West Decimal Degree -180.0000. Ancillary map: Caribbean area. "Routes shown on this map do not neccesarily conform to air tracks of actual operation.".
- Airways, Air travel, and World—Maps
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