000 00333nam a2200133Ia 4500
008 190719s9999 xx 000 0 und d
020 _a81-203-1080-2
082 _a621.381 H474
100 _aHELD,G
245 0 _aUNDERSTANDING DATA COMMUNICATIONS
260 _aNEW DELHI
_bPrentice Hall
_c1994
300 _a23X18
942 _cBK
_2DDC
999 _c44933
_d44933