Stratigraphic notes, 1989-1990 :  four short papers propose changes in stratigraphic nomenclature in Oregon,Vermont, Massachusetts and southern Pakistan 

 - Washington, D.C. :  United States Government Printing Office,  1991 
 - 40 p. :  ill. ;  28 cm. 
 - Geological Survey bulletin ;  1935 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic
<br/><br/><label>Dewey Class. No.: </label>551.700973