Coban, William Aubrey,  1916- <br/><br/>
Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming / 
by William A. Cobban 
 - Washington, D.C. :  United States Geological Survey,  1990 
 - iv, 13 p., 11 p. of plates :  ill., maps ;  28 cm. 
 - U.S. Geological Survey bulletin ;  no.1917 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ammonoidea--Wyoming--Natrona County<br/>Bivalves, Fossil--Wyoming--Natrona County<br/>Paleontology--Cretaceous<br/>Paleontology--Wyoming--Natrona County
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Frontier Formation
<br/><br/><label>Dewey Class. No.: </label>564.530978793