Régie des télégraphes et des téléphones de Belgique : 1930-1955
Report of the joint committee appointed by the lords of the committee of privy council for trade and the atlantic telegraph company to inquire into the construction of submarine telegraph cables
Principios de telephonia automatica : circuitos e sistemas de troncos / Harry P. Mahoney
Asian Telecom 89: Special session of the world telecommunication forum : Singapore / Singapore Telecoms; International Telecommunication Union