000			00453 a2200181 4500
003			ISURa
008			140813b xxu||||| |||| 00| 0 eng d
020			_a8176353191
041			_aEnglish
082			_a004.6 _bHEL
100			_aHeld , Gilbert
245			_aUnderstanding data communications
250			_a6th ed.
260			_c1999 _aNew Delhi _bTechmedia
300			_bill. _c24 cm. _axvi , 619 p.
650			_aCOMPUTER SCIENCE
942			_cSR _2ddc
999			_c34507 _d36054