Berg, Paul W. <br/><br/>
Elementary partial differential equations / 
Paul W. Berg, James L. McGregor. 
 - San Francisco :  Holden-Day,  c1966. 
 - xv, 421 p. : ill. 
 - Holden-Day series in mathematics .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Partial.