000			00290nam a2200133Ia 4500
082			_a153.42 _bWIT
100			_a, John _935056
245			_aThinking with concepts _c John Wilson
260			_aCambridge: _bC.U.P, _c1969.
300			_bx,171p.
500			_aPB
546			_aeng
942			_cBK
999			_c28431 _d28431