WEIR, Gordon W. <br/><br/>
Clays ferry formation (Ordovician) : a new map unit in South-Central Kentucky / 
by Gordon W. Weir and Robert C. Greene. 
 -- Washington :   United States Government Printing Office,   1965 
 - 18 p. -- 
 (Geological Survey Bulletin  ;  1224-B).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estratigrafía<br/>Kentucky<br/>Ordovícico
<br/><br/><label>Universal Decimal Class. No.: </label>551.733(769)