000
00285cam a2200121 4500
020
_a
0273024787 (pbk.)
100
1
_a
LANGLEY Graham
245
0
_a
Telecommunications primer
250
_a
2nd.
260
_a
London:
_b
Pitman Publishing,
_c
1986
300
_a
170p.
945
_i
0010490
_r
Y
_s
Y
999
_c
45813
_d
45813