Digital Maps and Geospatial Data | Princeton University
International air routes of United States carriers: September 30, 1951
- [Washington, D.C.] : [s.n.], 1951.
- United States. Civil Aeronautics Board. Bureau of Air Operations, Routes Division. North Decimal Degree 80.000000. South Decimal Degree -60.0000. 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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