walcott.J LITERATURE. 29 



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Owen, D. D. Geol. Survey of Iowa, Minnesota, and Wisconsin, and incidentally of 

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Owen, Richard. Description of the impressions and footprints of the Protichnites 

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Roemer, Ferd. Die Kreidebildungen von Texas uudihre organischen Einschlusse, 

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1854. 



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1855. 



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1856. 



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