000 00284nam a2200121Ia 4500
008 160710s1977 xx 000 0 und d
082 _a621.381 COJ
100 _aCOOLEN,JOHN
245 _aELECTRONIC COMMUNICATION
260 _bPRINTICE HALL
_c1977
300 _a706
942 _2ddc
_cB
999 _c42353
_d42353