Twenhofel, William H.  1875-1957, <br/><br/>
Principles of invertebrate paleontology / 
Robert r. shrock, William h. twenhofel 
 - 2 # a revised and enlarged /  Of twenhofel and shrock 
 - 816 páginas 
 - International series in earth sciences .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrados fósiles
<br/><br/><label>LC Class. No.: </label>QE770  / T83