Gordon, Mackenzie,  1913- <br/><br/>
Gastropoda, Cephalopoda, and Trilobita of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming / 
by Mackenzie Gordon and Ellis L. Yochelson 
 - Washington, D.C :  United States Government Printing Office,  1975 
 - iii, 30p. : [2 leaves of plates] :  ill. ;  29 cm. 
 - Professional paper - Geological Survey ;  848-F .
<br/><br/> Includes index 
<br/><br/>Bibliography: p. F27-F28 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gastropoda, Fossil--Wyoming<br/>Cephalopoda, Fossil--Wyoming<br/>Trilobites--Wyoming<br/>Paleontology--Carboniferous<br/>Paleontology--Wyoming<br/>Geology--Survey--Wyoming
<br/><br/><label>Dewey Class. No.: </label>564.309787