00372nam a22001337i 4500001001000000005001700010008004100027082001800068100002200086245005000108260004700158300001700205650001600222SXC01059420260819093506.0260101s1949    ii            000 0 eng d  a510 KRA-M222  aKratchik, Maurice10aMathematical recreations /cKratchik, Maurice  abGeorge Allen & Unwin Ltd., London,c1949  ap. ;c22 cm. 0aMathematics