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advance planning air facility air service air traffic air transport aircraft airlines airpark airport districts Airport Problem airways alfalfa approximately Asso bridge projects cent Chief of Engineers cities classes costs money depletion and deterioration employment emergency equipment estimated Eugene Reybold expansion expenditure facilities cost fact Federal Works Agency feet in length flood control flying freight funds future glide ratio going highway and bridge highway departments Highway Program highway system hundred inland waterways interregional highway Intracoastal Waterway investment Jack Frost Joint Airport Users Lakes landing facilities large numbers meet ment millions for maintenance movement municipal National Aeronautic Association normal operation passenger-miles peanut business period plane ports possible principle of user private airplane progress projects reported proposal railroads river and harbor river basins road and street routes stages of planning thing thousands tion type of thinking United user charges vehicle volume Washington