000			00390nam a2200145Ia 4500
003			NIELib
008			211019s9999||||xx |||||||||||||| ||und||
082			_a155.4 _bPIA
100			_aPiaget, Jean _92385
245			_aThe child's conception of physical causality
260			_bRoutledge Kegan paul. _c1930, _aLondon:
300			_a309p. _c22cm
650			_aChild Psychology
942			_2ddc _cLM
999			_c33423 _d33423