Gilbert <br/><br/>
Whoascum county problem book 

 - New York  Mathematical Association of America  1993 
 - ix,233p.  20cm 
 - Dolciani Mathematical exposition .
<br/><br/><label>ISBN: </label>0883853000 
<br/><br/><label>Dewey Class. No.: </label>510.76,GIL  / _