000 00321nam a2200121Ia 4500
001 81803
008 170722s9999 xx 000 0 und d
100 _aGinsburg, Herbert
245 _aChildren's arithmetic :
_b the learning process /
260 _bD van Nostrand
_aNew York
_c1977
300 _a197
_c23 cm.
942 _cGEN
999 _c10056
_d10056