Landman, Neil H. <br/><br/>
Scaphitid ammonites of the upper cretaceous (Maastrichtian) fox hills formation in South Dakota and Wyoming / 
Neil H. Landman, Karl M. Waage. 
 -- New York :   American Museum of Natural History,   1993 
 - 257 p.  il. -- 
 (Bulletin of the American Museum of Natural History, ISSN 0003-0090  ; 215).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Amonites - Estados Unidos
<br/><br/><label>Universal Decimal Class. No.: </label>56:591(78)