Telecommunication by speech

Basic carrier telephony Talley, David Modern telephony Harb, Mahmoud Telephone repair illustrated Bigelow, Stephen J. Standard country or area codes for statistical use: current information as at 31 August 1999 United Nations ; Department of Economic and Social Affairs Statistics Division National e-mail and fax directory The instant national locator guide Next generation 9-1-1 Zelik, Eugene B. Headquarters USA