000 00297nam a2200121Ia 4500
008 220201s1956 xx 000 0 eng d
082 _a621.382
_bEVE
100 _aEveritt, W.L. & Anner, G.L.
245 0 _aCommunication engineering
260 _bMcgraw hill
_c1956
300 _a644
942 _2ddc
999 _c14892
_d14892