000 00295nam a2200121Ia 4500
100 _aStallings, Williams
020 _a0-02-415471-7
942 _cBK
245 _aISDN an introduction
260 _aMacmillan Publication company, New York
_c1990
082 _a001.64404 Sta
300 _axii; 420p
999 _c66631
_d66631