International cabel directory of the world in conjuction with western union telegraphic code system / International Cable Directory Company
Tratado de telegrafía y telefonía : Guía para los empleados de telégrafos y teléfonos / Prof. Dr. Carlos Strecker; Manuel Álvarez Castrillón
model answers to city and guilds of london institute examinations in telecommunications principles II : including answers to similar questions in technical electricity, transmission and lines, and radio communication / Post office electrical engineers' journal
Telephonology / H. R. Van Deventer