Statistical factors of near-collisions reported to the Civil Aeronautics Board, September-December, 1956

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110 1 ‡aUnited States. ‡bCivil Aeronautics Board.
245 1 0 ‡aStatistical factors of near-collisions reported to the Civil Aeronautics Board, September-December, 1956.
260 ‡aWashington, ‡bU.S. Civil Aeronautics Board, Bureau of Safety, Analysis Division, ‡c1957.
300 ‡a8 p. (chiefly tables) ‡c27 cm.
538 ‡aMode of access: Internet.
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