000 00307nam a2200121Ia 4500
008 220601s2002 xx 000 0 eng d
100 _aCARLSON,BRUCE A.
245 0 _aCOMMUNICATION SYSTEMS
250 _a4th Ed.
260 _c2002
_aNew Delhi
_bMcGRAW HILL EDUCATION Pvt
300 _a850
942 _2ddc
_cBTECH
999 _c2168
_d2168