00422nam a22001577a 4500003000800000008004100008020001500049041001200064082001500076100001400091245005700105260004200162300002200204650001700226650002100243WUSLLib170308b        xxu||||| |||| 00| 0 eng d  a0691080976  aEnglish  a510.7bPOL  aPolya, G.  aHow to solve itba new aspect of mathematical method  aUSAbPrinceton University Pressc1973  axxi, 253p.c21cm.  aMathematics   aproblem solving