Green book
By: International Telegraph and Telephone Consultative Committee.
Publisher: International Telecommunication Union
Published: 1973
Place of publication: [Geneva]
Language: eng
Subjects: Telephone -- Congresses.; Telegraph -- Congresses.
Notes: Includes bibliographical references.
At head of title: Fifth Plenary Assembly, Geneva, 4-15 December 1972.
Table of contents: title: v. 6. Telephone signalling and switching.