BOERICKE, WILLIAM F. <br/><br/>
OPERATING & PROSPECTING SMALL GOLD PLACERS 

 - 2 
 - NEW YORK-U.S.A.  JOHN WILEY Y SONS  199 
 - 145 pag  19 cm 
 - 0  0 .
<br/><br/>GOLD-OPERATING 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CIENCIAS PURAS
<br/><br/><label>Dewey Class. No.: </label>549.23  / B66