000 00278nam a2200121Ia 4500
008 230222s9999 xx 000 0 und d
082 _a621.382
100 _aRobert L Shrader
245 0 _aElectronic Communication
250 _a1
260 _bMc Graw Hill
_c1993
942 _cBK
999 _c17104
_d17104