000 00284nam a2200109Ia 4500
008 190912s9999||||xx |||||||||||||| ||und||
100 _aFred Halsall
245 0 _aData Communications Computer Networks and Open Systems
260 _aUSA
_bMcGraw Hill
_c2000
300 _a907
942 _cBK
999 _c7453
_d7453