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999 _c51068
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020 _a81-203-1080-2
041 _aen
082 _a004.6
100 _aHELD,Gilbert
_92155
245 0 _aUnderstanding Data Communications
250 _a4th
260 _aNew Delhi
_bPrentice - hall of India (Pvt)
_c1996
300 _axvii,435p.
650 _aData Communications
_92156
650 _aUnderstanding
_91064
942 _cPR
_2ddc