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MARR (JOHN E.)- 



1883. The classification of the Cambrian and Silurian rocks. Being the 



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MURCHISON (RODERICK I.). 



1836. On the Silurian and Cambrian systems, exhibiting the order in 

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SEDGWICK (AD AM). 



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WALCOTT (CHARLES D.). 



1884. On the Cambrian faunas of North America. Preliminary studies 



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