000 00281nam a2200121Ia 4500
003 LDD
040 _cLDD
041 _aen
245 0 _aData Communications
260 _aMcGraw-Hill Information Systems Co.
_bNew York
_c1 Sep-31 Dec,1991
362 _a20-20
_b13-17
942 _2ddc
_cJ
999 _c179839
_d179839