The International Telegraph and Telephone Consultative Committee Telegraph transmission; Telgraph services terminal equipment : series R recommendations

Telegraph transmission; Telgraph services terminal equipment : series R recommendations . - Geneva : International Telecommunication Union, 1989 . - XI, 281 p. : il. 30 cm . - (Blue book . Volume VII; 1)
92-61-03591-4 (Brochado)

621.39