00550nam a2200169 a 450000500170000000800410001704000240005810000220008224500380010426000460014230000540018850000200024265000230026265000490028570000230033470000230035720231107084958.0090401s19uu    xx            00    eng d  6HSLRCaHSLRCcHSLRC10aEicholz, Robert E10aInvestigating school mathematics 0 aMenlo Park, CA :bAddison-Wesley,cc1973.  a1 v. (various pagings) :acolored. illustrations.  aIncludes index. 4aMathematicsx1901- 4aMathematicsxStudy and teaching (Elementary)  aPhares G. O'Daffer  aCharles R. Fleenor