Descripción
descrición da copia:At head of title: International Telecommunication Union.
Descrición Física:10 v. in 30 : ill. ; 30 cm.
Bibliografía:Includes bibliographical references and index.
ISBN:9261009212 (v. 2, pt. 1)
9261010717 (v. 6, pt. 3)
9261010814 (v. 6, pt. 4)
9261010911 (v. 6, pt. 5)
926101111X (v. 6, pt. 7)
9261011810 (v. 9)
9261011918 (v. 10, pt. 1)
9261012019 (v. 10, pt. 2)
9261009115 (v. 1)
926100931X (v. 2, pt. 2)
9261009417 (v. 2, pt. 3)
9261009514 (v. 2, pt. 4)
9261010415 (v. 5)
9261010512 (v. 6, pt. 1)
926101061X (v. 6, pt. 2)
9261011519 (v. 8, pt. 1)
9261011616 (v. 8, pt. 2)
9261011713 (v. 8, pt. 3)
9261011411 (v. 7, pt. 2)
9261011217 (v. 6, pt. 8)
9261011314 (v. 7, pt. 1)