000			00454nam a22001577a 4500
008			170513b xxu||||| |||| 00| 0 eng d
020			_a9788178080987
082			_223 _a001.64404 _bHAL
100			_aHalsall, Fred
245			_aData communications, computer networks and open systems
250			_a3rd ed.
260			_aSingapore _bAddison Wesley _c1999
300			_axvi,907p.; _c24cm.
650			_2Computer Science _aComputer Science
942			_2ddc _cBK
999			_c8316 _d8316