Gwynne, Charles Sumner,  1885- <br/><br/>
Pegmatites in the Beecher Rock basin, 
by Charles S. Gwynne. 
 - Vermillion, S.D.,  University of South Dakota,  1944. 
 - 23 p.  illus. 
 - South Dakota Geological Survey. Report of investigations,  no. 48 .
 - Report of investigations (South Dakota Geological Survey) ;  no. 48. .
<br/><br/> At head of title: State of South Dakota, M. Q. Sharpe, Governor. State Geological Survey, E. P. Rothrock, State Geologist.  Reproduced from type-written copy. 
<br/><br/>"Selected bibliography": leaf at end. 
<br/><br/><label>LCCN: </label>gs 44000050  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pegmatites.<br/>Geology--South Dakota--Custer County.
<br/><br/><label>LC Class. No.: </label>QE461  / .G9