C RET AC I C BIBLIOGRAPHY. 



771 



1885 The genus Pyrgulifera Meek 



and its associates and congeners. 

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1886 Relation of the Laramie 



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1892 Stanton, T. W. The stratigraphic 

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1897 Gilbert, G. K. Pueblo, Colorado. 

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1899 Cross, W., etc. Telluride, Colo- 

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1903 Notice of six new species 



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1903 Douglass, E. Astropecten ? mon- 

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1904 Henderson, J. Paleontology of 

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1905 Fisher, C. A. Nepesta, Colo- 

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1906 Fenneman, N. H., and Gale, H. 

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1906 Keyes, C. R. The Dakotan series 

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1907 Notice of an American spe- 

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