000 00251nam a2200097Ia 4500
100 _aWalter Leighton
245 _aIntroduction to the Theory of Differential Equations
260 _c1952
_aNew York;
_aToronto;
_aLondon
_bMGH
300 _aviii+171
942 _cBK
999 _c800
_d800