000			00497nam a22001577a 4500
005			20220519140858.0
008			091113t xxu||||| |||| 00| 0 eng d
082			_a004.6 _bFIT
100			_aFitzgerald, Jerry _97144
245			_aBusiness data communications/ 2ed _bBasic concept , security and design
250			_a2nd ed.
300			_axix,656p.
653			_aData transmission systems _a computer net works _a Office practice auto mation
942			_cBK
260			_c1984 _aNew York _bJohn Wiley
999			_c311236 _d311236