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Omnirange System Ind.) 1958 Washington International Symposium On The U.S. Domestic Short Distance Navigation System--Vortac--And Its Relationship To The International Air Navigation System (1958 : Washington D.C.; Indianapolis And Indianapolis Congresses International Symposium On The U. S. Domestic Short Distance Navigation System - Vortac - And Its Relationship To The International Air Navigation System Aids To Air Navigation