Yearbook of statistics : telecommunication services: chronological time series 1994-2003 / International Telecommunication Union
International telecommunication regulations : final acts of the world administrative telegraph and telephone conference: Melbourne, 1988: (WATTC-88)
World telecommunication standardization assembly : Montreal, 27 de September - 6 October 2000 / ITU-T Telecommunication Standardization Sector of ITU
Earthing of telecommunication installations / International Telecommunication Union
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