000 00253 a2200109 4500
001 31399
090 _c21283
_d21283
100 _aMcDonald, John C
245 _aFundamentals of Digital Switching, 2/e
250 _a2
260 _aN.Y
_bPlunum
_c1990
942 _aNUST-CAE
_k621.381537MCD
999 _c266472
_d266472