Regional structure of the Southeast Missouri and Illinois-Kentucky mineral districts / 
by A. V. Heyl...[et al.]. 
 -- Washington :   United States Government Printing Office,   1965 
 - 20 p. + map. -- 
 (Geological Survey Bulletin  ;  1202-B).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Illinois<br/>Kentucky<br/>Mineralogía<br/>Missouri
<br/><br/><label>Universal Decimal Class. No.: </label>549(73)