000 00432nam a2200157Ia 4500
008 241225s9999 xx 000 0 und d
020 _a0070447446
082 _a004.678
_bHEL
100 _aHeld, Gill.
245 0 _aVoice and data internetworking
250 _a3rd edition.
260 _aDelhi :
_bTata Mcgraw Hill Publishing Company Ltd,
_c1994
300 _a397.
365 _a375
650 _aData processing computer science
999 _c28628
_d28628