000 00320nam a2200121Ia 4500
008 231011s9999 xx 000 0 und d
041 _aeng
100 _aWilliam A.Shay
245 _aUnderstanding Data Communications & Networks
250 _a2001 2
260 _bVikas Pubs. House Pvt ltd ,New Delhi -
365 _b350
999 _c887090
_d887090