000			00311nam a22001217a 4500
082			_a155.41308 _bGRU.E
100			_a Gruber, Howard E
245			_aEssential piaget / _cby Howard E Gruber and J Jacques Voneche
260			_aLondon : _bRoutledge, _c1977.
300			_a881p. :
650			_aPiaget
942			_cBK
999			_c327922 _d327922