000 00317nam a2200121Ia 4500
020 _a007009957X
100 _aBruce Carlson A
245 _aCommunication Systems:An Introduction to signals and noise in electrical communication
250 _a2
260 _c1975
_bMcGRAW HILL
_aTokyo
300 _axv+494
942 _cBK
999 _c6822
_d6822