Langer, Rudolph E. <br/><br/>
A first course in ordinary differential equations / 
Rudolph E. Langer 
 - New York :  Wiley ,  1954 
 - xii, 249p. :  ill. ;  22 cm.  
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations
<br/><br/><label>Dewey Class. No.: </label>517.38  / LAN