000
00274nam a2200121Ia 4500
100
_a
DAS P N
365
_c
RS
365
_d
1
942
_c
ENGBK
245
_a
An Introduction to Manual Digital Telephony
260
_b
Modern Book Agency
_c
1990
_a
Calcutta
300
_a
III+150 PP
999
_c
4871
_d
4871