000 00295nam a2200121Ia 4500
001 84315
008 170722s9999 xx 000 0 und d
100 _aPiaget, Jean And
245 _aPsychology of the child tr by Helen weaver /
260 _c1969.
700 _aInhelder, Barbel
942 _cGEN
999 _c77281
_d77281