Telegraph and telematic services operations and tariffs : recommendations of the F series
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Telegraph and telematic services operations and tariffs : recommendations of the F series
(Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980 / CCITT, The International Telegraph and Telephone Consultative Committee, v. 2 ; fasc. 2-4)
International Telecommunication Union, 1981
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