000 00257nam a2200109Ia 4500
082 _a510
_bDEN
100 _aDenhilm
245 _aInsighr into school mathematics
_cDenhilm
260 _aAmerica
_bScience reserch Associates
_c1968
300 _a440
942 _cBK
999 _c1979
_d1979