00252nam a2200097Ia 4500008004100000040002500041082001300066245002800079260003900107300000800146230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a 510 Sm6 0aLigthning math mastery   bAbiva Publishing House, Inc.c1974  a353