000 00283nam a2200109Ia 4500
008 170707s9999 xx 000 0 und d
050 _a600 S56 1991
100 _a"Sandrews, Mark"
245 0 _aCommunication technology: today and tomorrow
260 _c1991
942 _2lcc
_cBK
_kCirc.
999 _c14165
_d14165