@book{ Solr-4337377, title = {Routes to United States authorized to foreign air carriers of Western Hemisphere countries under permit, December 31, 1971.}, editor = {United States. Civil Aeronautics Board. Office of Facilities and Operations}, address = {Washington,}, year = {1971}, note = {Includes index to air carriers, listing of "Area permits (nonscheduled)" and inset.}, }