Langer, Rudolph E.  1894-1968. <br/><br/>
A first course in ordinary differential equations / 
Rudolph E. Langer. 
 - New York :  Wiley,  c1954. 
 - xii,249p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>
<br/><br/><br/>english 
<br/><br/><label>LCCN: </label>54005326  
<br/><br/><label>Nat. Bib. No.: </label>GB54-5087 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>LC Class. No.: </label>QA371  / .L26 
<br/><br/><label>Dewey Class. No.: </label>517.38/LAF