000 00314nam a2200133Ia 4500
008 230222s9999 xx 000 0 und d
082 _a004.6
100 _aGilbert Held
245 0 _aUnderstanding Data Communications
250 _a4
260 _bPrentice Hall Of India
_c1994
650 _aCOMPUTER
942 _cBK
999 _c6967
_d6967