00273nam a2200121Ia 4500003000400000008004100004020001400045040000800059245002600067260002700093300001000120440002100130LDD181029s9999    xx            000 0 und d  a216923417  cLDD 0aMathematics in action  aLondonbBlackiesc1989  a189p.  aPupils booksv5A