000 00258nam a2200109Ia 4500
008 220201s9999 xx 000 0 eng d
100 _aCOUCH, LEON W.
245 0 _aDIGITAL & ANALOG COMMUNICATION SYSTEMS
250 _a8TH
260 _bPEARSON
942 _2ddc
999 _c99932
_d99932