000 00261nam a2200109Ia 4500
008 220201s1960 xx 000 0 eng d
100 _aFord,Lester,R
245 0 _aDiffrenetial equations
260 _bNewyork:D vannostrand
_c1960
300 _a451
942 _2ddc
999 _c71830
_d71830