000 00253nam a2200109Ia 4500
008 220201s9999 xx 000 0 eng d
100 _aCARLSON (A BRUCE)
245 0 _aCOMMUNICATION SYSTEMS
250 _a3RD
260 _bTATA MCGRAW HILL
942 _2ddc
999 _c94430
_d94430