000 00332nam a2200133Ia 4500
008 220201s1996 xx 000 0 eng d
082 _a5.71
_bHEL
100 _aHeld,Gilbert
245 0 _aUnderstanding data communication
250 _a5th ed.
260 _bPrentice Hall of India
_aNew Delhi
_c1996
300 _a435p.
942 _2ddc
999 _c9909
_d9909