Kells, Lyman M.  1888- <br/><br/>
Elementary differential equations / 
[by] Lyman M. Kells. 
 - 6th ed. 
 - New York,  McGraw-Hill  c1965 [printing 1981]. 
 - xii, 430 p.  illus.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>Dewey Class. No.: </label>515.35   / KEE 1965