000 00312nam a2200133Ia 4500
008 221117b |||||||| |||| 00| 0 eng d
040 _aBGL
_cBGL
082 _a001.642SIN:C
100 _aSingh R.P.
245 0 _aCommunication System
260 _aNew Delhi
_bTata Mc Graw
_c2014
300 _a584p
942 _cGB
999 _c32676
_d32676