000			00428nam a2200181Ia 4500
008			200428s9999||||xx |||||||||||||| ||und||
020			_c375
040			_aMAIN
041			_aEnglish
082			_a004.6 _bHAL
100			_aHalsall, Fred
245			_aData communication,computer networks and open systems
250			_a4th ed.
260			_bPearson Education _c1999
300			_a907p.
650			_aCOMPUTER
942			_cGB
999			_c1939 _d1939