1968
The Fourth Plenary Assembly of the International Telegraph and Telephone Consultative Committee, Mar del Plata

WM: 9


[The Fourth Plenary Assembly of the International Telegraph and Telephone Consultative Committee, Mar del Plata, type ZY]


[The Fourth Plenary Assembly of the International Telegraph and Telephone Consultative Committee, Mar del Plata, type ZZ]


[The Fourth Plenary Assembly of the International Telegraph and Telephone Consultative Committee, Mar del Plata, type AAA]

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