00270nam a2200109Ia 4500008004100000040002500041082001200066100002400078245001500102260003500117300000800152230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a511 K46  aKerr, Donald R. Jr. 0aArithmetic  bMcGraw-Hill Book Companyc1977  a725