Chronic,Halka <br/><br/>
Molluscan fauna from the Permian Kaikab formation,Walnut Canyon,Arizona 

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 - New York - EEUU  Geological Society of America  1952 
 - 170p.  23x36cm 
 - Bulletin of the Geological Society of America   v.63 .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label>--Moluscos fosiles--Paleozoologia--Paleontologia--Permico--Formacion Kaibab--Caņon Walnut--Arizona--Estados Unidos<br/>Geologia