Sohl, Norman F. <br/><br/>
Changes in stratigraphic nomenclature by the U.S. Geological Survey / 
Norman F. Sohl and Wilan B. Wright 
 - Washington, D.C. :  United States Geological Survey,  1978 
 - (A-136) p. ;  23 cm. 
 - Contributions to stratigraphy Geological Survey bulletin  no.1457-A .
<br/><br/> Description based on: 1979. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Nomenclature--United States
<br/><br/><label>Dewey Class. No.: </label>551.700973