HARDIN, George C. <br/><br/>
Geology and fluorspar deposits, big four fault system, Crittenden County, Kentucky / 
by George C. Hardin and Robert D. Trace. 
 -- Washington :   United States Government Printing Office,   1959 
 - P. 699-724 + map. -- 
 (Geological Survey Bulletin  ;  1042-S).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Depósitos de minerales<br/>Kentucky
<br/><br/><label>Universal Decimal Class. No.: </label>553(769)