Emmons, William H.  1876- <br/><br/>
The enrichment of sulphide ores / 
by William Harvey Emmons. 
 - Washington,  Govt. Print. Off.,  1913. 
 - 260 p. ;  24 cm. 
 - U.S. Geological survey. Bulletin 529 .
 - United States.  Geological Survey.  Bulletin ;  529. .
<br/><br/> Includes index. 
<br/><br/><label>LCCN: </label>gs 13000377  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sulfides.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 529