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1.

図書
図書
1. 36th Annual Air Traffic Control Association Conference proceedings, Fall 1991, the Hyatt Regency Crystal City, Arlington, Virginia, September 29-October 3, 1991
Air Traffic Control Association Conference
出版情報: Arlington, Virginia : Air Traffic Control Association, 1990  xxv, 526 p. ; 26 cm
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2.

図書
図書
2. 35th Annual Air Traffic Control Association Conference proceedings, Fall 1990, Hyness Convention Center, Sheraton Boston Hotel, Boston, Massachusetts, September 16-20, 1990
Air Traffic Control Association Conference
出版情報: Arlington, Virginia : Air Traffic Control Association, 1990  xxi, 636 p. ; 26 cm
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