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- catalog contributor b5248658.
- catalog created "1946.".
- catalog date "1946".
- catalog date "1946.".
- catalog dateCopyrighted "1946.".
- catalog extent "4 maps.".
- catalog issued "1946".
- catalog issued "1946.".
- catalog language "eng".
- catalog publisher "[Washington], The Board.".
- catalog title "United States air transportation system: Routes permanently certificated June 30, 1946; September 30, 1946; Routes certificated for limited periods, June 30, 1946; December 31, 1946.".
- catalog type "text".