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BIBLIOGRAPHY. 



1. A. H. WORTHEN. 



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Geology of the Des Moines Valley. In Report Geol. Sur- 

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3. A. H. WORTHEN. 



Geology of certain Counties, embracing the results of ex- 

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4. A. H. WORTHEN. 



Remarks on the Discovery of a Terrestrial Flora in the 

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Notice of a new species of Platycrinus and other fossils 

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Descriptions of new species of Crinoidea and Echinoidea, 

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