00306nam a2200121Ia 45000030006000000080041000060400015000471000033000622450051000952600009001465460012001550050017001670STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBrumfiel Charles, F.; Others  aFundemental concepts of elementary mathematics  c1962  aEnglish20220125170023.0