000 00288nam a2200109Ia 4500
008 170707s9999 xx 000 0 und d
050 _a510 F754
100 _a"Foster, David"
245 0 _aInter-active mathematics: activities and investigation
260 _c1995
942 _2lcc
_cBK
_kCirc.
999 _c13930
_d13930