Langley, Graham.
Telecommunications primer / Graham Langley. - 2nd ed. - London : Pitman, 1986 - vi, 170 p. : ill.
Telecommunication.
TK5101 / .L3165 1985
384�19
Telecommunications primer / Graham Langley. - 2nd ed. - London : Pitman, 1986 - vi, 170 p. : ill.
Telecommunication.
TK5101 / .L3165 1985
384�19