Elementary Differential Equations and Boundary Value Problems 
Wiliam E. Boyce and Richard C. DiPrima 
 - 22 ed 
 - New york  John Wiley  1969 
 - xv,627.;23cm  Includes bibliographical reference and index  23cm 
<br/><br/><label>Dewey Class. No.: </label>515.35 BOY