Bassler, Ray S. <br/><br/>
Shelled creatures and geological history. 

 - New York :  Smithsonian Institution,  1944. 
 - 375 p. :  il. ;  21 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estratigrafía<br/>Geología histórica
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>551.7(73)