William Lowell Putnam Mathematical Competition : 

 - Washington, DC :  Published and distributed by the Mathematical Association of America,  1980 
 - xi, 652 p. :  ill. ;  25 cm. 
 - MAA problem books series .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9780883854624 (pbk.) | 0883854287 (pbk.)