000 00292nam a2200121Ia 4500
008 220201s1981 xx 000 0 eng d
082 _bSHR
100 _aShrader,Robert L
245 0 _aElectronic communication
260 _aNew Delhi
_bMc graw Hill Pub
_c1981
300 _a801
942 _2ddc
999 _c24696
_d24696