00354cam a2200133ua 4500020000900000041001000009082001900019100001800038245007700056260006100133300001200194365000900206504000500215  c8.80  aengh  a515.35bGRE/IN  aGreen, S L  .  aIntroduction to differential equations / cS.L.Green.hTextual Documents  aNew York : bUniversities Tutorials Press Ltd. , c1945.  a137 ; .  a8.80  a