00330nam a22000977a 450000500170000008200150001724501240003226000520015630000090020865000150021720260429114032.0  a510.72 MAT  aMathematics laboratories:bimplementation, research and evaluation/cedited by William M. Fitgerald and John L. Higgins  aOhio:bERIC Ingormation Analysis Centre,c1974.  a81p.  a510.72 MAT