00578nam a2200193Ia 4500001000700000003000500007005001700012008004100029010001500070041001100085050002300096082000800119100002900127245009100156260003500247300002700282490003600309650003900345113312BIBL20160527183547.0711124s1967    nyua          00000 eng    a 65023826 1 aengger0 aQA93b.F6813 1967b  a51010aFreudenthal, Hans2Local10aMathematics observed.cTranslated from the German by Stephen Rudolfer and I. N. Baker.0 aNew YorkbMcGraw-Hillc[c1967]  a256 p.billus.c20 cm.0 aWorld university library2Local 0aMathematicsxPopular works.2Local