000
00284nam a22001097a 4500
020
_a
9780135990285
082
_a
621.382752
100
_a
COUCH II,Leon W
245
_a
Digital and analog communication systems
260
_a
New Jersey
_b
prentice hall international
_c
1997
942
_c
BK
999
_c
452893
_d
452893