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  • National Transportation Safety Board
    view article (9.076204)

    Special Investigation Report. Air Traffic Control System.
    National Transportation Safety Board, Washington, DC
    NTSB-SIR-81-71, December 8, 1981, 57 p.

  • Weiger, P.
    view article (9.076204)

    Controlled Tower.
    NFPA Journal, Vol. 97, No. 3, 68-72, May/June 2003