000 00284nam a2200121Ia 4500
100 _aSchweber, William L.
020 _a0-07-001097-8
942 _cBK
245 _aData communications
260 _aMcGraw-Hill Book company, New York
_c1988
082 _a001.64 Sch
300 _axi,564
999 _c64405
_d64405