Norton, James J.  1918-2005 <br/><br/>
Geology of the Hugo Pegmatite Keystone, South Dakota / 
J.J. Norton, L.R. Page and D.A. Brobst. 
 -- Washington :   United States Government Printing Office,   1962 
 - P. 49-127 + 1 map. -- 
 (Geological Survey Professional Paper  ;  297-B).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dakota del Sur<br/>Geología
<br/><br/><label>Universal Decimal Class. No.: </label>55(783)