Mamay, Sergius H.  1920-2008 <br/><br/>
Occurrence and significance of Marine Animal remains in American coal balls / 
by Sergius H. Mamay and Ellis L. Yochelson. 
 -- Washington :   United States Government Printing Office,   1962 
 - P. 194-224, [10] h. de lam. -- 
 (Geological Survey Professional Paper  ;  354-I).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fósiles marinos
<br/><br/><label>Universal Decimal Class. No.: </label>56