000 00252nam a2200085Ia 4500
008 180131b1976 xxu||||| |||| 00| 0 eng d
080 _a
_b621.395.345 JOE.76
100 _aJoel, Amos E., Ed.
245 _aElectronic Switching: Central Office Systems Of The World
260 _a
_bIEEE
_c1976
999 _c49914
_d49914