00329nam a2200133Ia 4500008004100000020001500041041001200056082001600068100001400084245004200098260003300140300000800173650001400181221030s9999    xx            000 0 und d  a8173191794  aEnglish  a105.23bHug  aL. Hughes 3aAn Introduciton to Data Communication  bNarosa Pub.aNew Delhic1999  a502  aComputers