000 00306nam a2200133Ia 4500
008 231004s9999||||xx |||||||||||||| ||und||
020 _a9788131518410
041 _aeng
100 _aBlake, Roy
245 0 _aElectronic communication system
250 _a2nd ed.
260 _bCengage
_c2002
942 _cBK
999 _c22495
_d22495