International telephone service operation : recommendations E.100-E.323
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International telephone service operation : recommendations E.100-E.323
(Red book : VIIIth Plenary Assembly, Malaga-Torremolinos, 8-19 October 1984 / CCITT, the International Telegraph and Telephone Consultative Committee, vol. 2 ; fasc. 2-2)
International Telecommunication Union, 1985
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