Geology and beryl deposits of the peerless pegmatite Pennington county South Dakota / 
by Douglas M. Sheridan...[et al.]. 
 -- Washington :   United States Government Printing Office,   1957 
 - 47 p. + 1 map. -- 
 (Geological Survey Professional Paper  ;  297-A).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dakota del Sur<br/>Geología
<br/><br/><label>Universal Decimal Class. No.: </label>55(783)