Etgen, Garret J. <br/><br/>
An Introduction To Ordinary Differential Equations 
/ by Garret J. Etgen 
 - New York:  Harper & Row, Publishers,  1937. 
 - 517p. 
<br/><br/><label>ISBN: </label>006041913X 
<br/><br/><label>Dewey Class. No.: </label>515.352  / ETG/A