00294nam a2200121Ia 45000030006000000080041000060400015000471000026000622450046000882600009001345460012001430050017001550STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNorthrop Eugene, P.D.  aRiddles i mathematics a book of paradoxes  c1944  aEnglish20220125170024.0