00340    a2200121   4500020001800000082001000018100001800028245007300046260003400119300001100153650003600164700001800200  a9780140124996  a510.7  aPolya, George  aHow to solve it: A new aspect of mathematical method.c George Polya  aNew YorkbPenguin Groupc1990  a253 p.  aMathematics--Study and teaching  a George Polya