Kells, Lyman M. 1888- Differential equations: a brief course with applications [by] Lyman M. Kells. - x, 252 pages. illustration. 23 cm. Bibliographical footnotes. LCCN: 68016169 Subjects--Topical Terms: Differential equations. LC Class. No.: QA372 / .K44 Dewey Class. No.: 517/.55