000 00313nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a004.6
_bHEL
100 _a HELD (Gilbert)
245 0 _aUnderstanding Data Communications from Fundamentals Networking
260 _b John Wiley & Sons
_a Chichester
942 _cBK
999 _c2831
_d2831