Code of stratigraphic nomenclature / 
American Commission on Stratigraphic Nomenclature 
 - Oklahoma :  Tulsa,  1970 
 - 22 p. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Nomenclature--North America