000
00361nam a2200169Ia 4500
100
_a
Duck/Michael/ Read/R
650
_a
Communications
250
_a
2
942
_c
BK
366
_f
20
245
_a
Data communications and computer networks
260
_b
Pearson
_c
2011
082
_b
DUC
300
_a
415
546
_a
ENGLISH
_c
Computers
999
_c
23915
_d
23915