Shrock, Robert R; Twenhofel, William H <br/><br/>
Principles of invertebrate paleontology 

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 - McGraw-Hill book Co, Inc., NewYork  1953 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleoecology and fossils of specific environments
<br/><br/><label>Dewey Class. No.: </label>560.45  SHR-P