Langer, Rudolph E. . <br/><br/>
A First Course in Ordinary Differential Equations /  Textual Documents 
Rudolph E.Langer. 
 - 1st ed. / 
 - New York :  John Wiley & Sons ,  C1954. 
 - vii,249p. :  ill ;  22cm . 
<br/><br/>Index 
<br/><br/><label>Subjects--Index Terms: </label>Differential Equations G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>517.2  / L262 Or