Cobban, William A. <br/><br/>
Tarrantoceras stephenson and related ammonoid genera from cenomanian (upper cretaceous) rocks in Texas and the western tnterior of the United States / 
by William A. Cobban 
 - Washington :  United States Government Printing Office,  1988 
 - iv, 30 p. :  ill. ;  28 cm. 
 - U.S. Geological Survey professional paper ;  1473 .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ammonoidea
<br/><br/><label>Dewey Class. No.: </label>564.53