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Maybe You Had to Be There: The SIGINT on Thirteen Soviet Shootdowns of U.S. Reconnaissance Aircraft.
Originally published in the classified journal Cryptologic Quarterly in 1993.
http://www.fas.org/irp/nsa/maybe_you.pdf
Originally published in the classified journal Cryptologic Quarterly in 1993.
http://www.fas.org/irp/nsa/maybe_you.pdf