Cobban, William Aubrey,  1916- <br/><br/>
Scaphitoid cephalopods of the Colorado group.  Evolution of Scaphites and related genera, with descriptions and illustrations of new species and a new genus from western interior United States. 

 - Washington,  U.S. Govt. Print. Off.,  1951. 
 - iii, 42 p.  illus., 21 plates.  29 cm. 
 - Geological Survey professional paper 239 .
 - Geological Survey (U.S.).  Professional paper ;  239. .
<br/><br/>"References": p. 39. 
<br/><br/><label>LCCN: </label>gs 52000121  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ammonoidea.<br/>Scaphites.<br/>Paleontology--Cretaceous.
<br/><br/><label>LC Class. No.: </label>QE75  / .P9 no. 239 
<br/><br/><label>Dewey Class. No.: </label>564.53 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:239