000			00277nam a2200121Ia 4500
100			_aPiaget, Jean
942			_cBK
654			_a
245			_aOrigin of intelligence in the child
260			_aLondon _bRoutledge & Kegan Paul _c1953
082			_a155.413
300			_c22cm _a425
999			_c416397 _d416397
041			_aeng