Loughlin, G. F.  1880-1946. <br/><br/>
The oxidized zinc ores of Leadville, Colorado, 
by G. F. Loughlin. 
 - Washington,  Govt. print. off.,  1918. 
 - 91 p.  VIII pl. (part fold.; incl. map, diagrs.) diagrs.  24 cm. 
 - U.S. Geological survey. Bulletin  681 .
<br/><br/> At head of title: Department of the interior. 
<br/><br/><label>LCCN: </label>gs 19000035  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zinc mines and mining--Colorado.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 681