Elementary differential equations /
Kells, Lyman M. (Lyman Morse), 1888-.
Elementary differential equations / Lyman M. Kells. - 4a. - New York : McGraw-Hill, 1954. - x, 266 p. ; 24 cm.
QA371 / K45 1954
Elementary differential equations / Lyman M. Kells. - 4a. - New York : McGraw-Hill, 1954. - x, 266 p. ; 24 cm.
QA371 / K45 1954