00538nam a2200169Ia 450000500170000000800460001703700120006304000200007504100130009508400190010810000330012724500320016026000440019230000130023649000450024954600740029420250508161642.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDLbengcFEDL  aeng2eng  a510, PHIqFEDL  aSanders Walter J. and others 0aDeveloping mathematics: Six  aLondon, UKbThe Macmillan Companyc1971  aix,406p.  aThe Macmillan School Mathematics Program  aJt. authors: Tina Thoburn; Jo McKeeby Phillips; J Franklin Fitzgerald