Gilbert, George T. <br/><br/>
The Wohascum Country Problem Book ( Volume-14 ) 
/ by George T. Gilbert   
 - America;  The Mathematical Association Of America:  1993. 
 - ix, 233p. 
<br/><br/><label>ISBN: </label>0883853167 
<br/><br/><label>Dewey Class. No.: </label>510  / GIL/T