00682nam a2200193Ia 450000500170000000800460001703700120006304000210007504100130009608400210010924500530013024500480018326000750023130000100030654600260031694200210034299900210036395201040038420250508161722.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a510.7, NATqFEDL 0aLearning of mathematics: Its theory and practice 0cNational Council of Teachers of Mathematics  aWashington, USAbThe National Council of Teachers of Mathematicsc1953  a355p.  aTwenty-first yearbook  cTEXLh510.7, NAT  c1371726d1371726  00104070aFEDLbFEDLd2025-05-08l0o510.7, NATpEL0059760r2025-05-08 16:17:22w2025-05-08yTEXL