121. International, overseas and territorial air routes of United States carriers: March 31, 1959
International, overseas and territorial air routes of United States carriers: March 31, 1959. Washington, D.C. : [s.n.], 1959. princeton-b2773x551. 1959. United States. Civil Aeronautics Board. Bureau of Air Operations, Routes Division. North Decimal Degree 90.000000. South Decimal Degree -90.0000. E...