General characteristics of international telephone connections and circuits : recommendations G.101-G.181
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General characteristics of international telephone connections and circuits : recommendations G.101-G.181
(Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980 / CCITT, The International Telegraph and Telephone Consultative Committee, vol. 3 ; fasc. 3-1)
International Telecommunication Union, 1981
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