000 00294nam a2200121Ia 4500
100 _aPiaget, Jean
942 _cBK
654 _a
245 _aChild's conception of number
260 _aLondon
_bKegan Paul, Trench, Trubner & Company Limited
_c1928
082 _a155.4
300 _bHb
_aviii,760
999 _c421904
_d421904
041 _aeng