00402nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000230010410000230012724500730015026000330022321853UR20220427165352.0061103|||||||||||||||||||||||||||||||| d  a(janium) 21842  a(janium)21841 4aQA135.5b.M67 19381 aMorton, Robert Lee10aTeaching arithmetic in the elementary schoolb : intermediate grades  bSilver Burdett Companyc1938