00329nam a2200121Ia 4500008004100000100001600041245004700057250001900104260004400123650001600167942000700183999001700190190216s9999||||xx |||||||||||||| ||und||  aIan Sneddon 0aElements Of Partial Differential Equations  aSECOND EDITION  bMcgraw-Hill International Editionc1957  aMathematics  cBK  c31109d31109