Wells, Roger Clark,  1877-1944. <br/><br/>
Analyses of rocks and minerals from the laboratory of the United States Geological Survey, 1914-36, 
tabulated by Roger C. Wells, chief chemist. 
 - Washington,  U.S. Govt. Print. Off.,  1937. 
 - x, 134 p.  tables.  23 cm. 
 - United States.  Gelogical survey.  Bulletin 878 .
<br/><br/> At head of title: United States Department of the Interior. 
<br/><br/><label>LCCN: </label>gs 37000085  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rocks--Analysis.<br/>Ores--Sampling and estimation.<br/>Chemistry, Analytic.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 878