Ward, Lauck W. <br/><br/>
Straitgraphic revision of the middle Eocene, oligocene and lower miocene / 
Lauck W. Ward, David R. Lawrence and Black W. Blackweld 
 - Washington, D.C. :  U.S. Government Printing Office,  1978 
 - Various pagings ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--United States
<br/><br/><label>Dewey Class. No.: </label>551.70973