000 00267nam a2200121Ia 4500
999 _c17576
_d17576
020 _a0177710063
100 _aDouglas Lewin
245 _aLogical Design of switching Circuits
250 _a2
260 _c1980
_bE.L.B.S
_aSingapore
300 _axii+404
942 _cBK