[The Ancient Life History of the Earth by Henry Alleyne Nicholson]@TWC D-Link bookThe Ancient Life History of the Earth
CHAPTER VII
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Generalised section of the Lower Silurian rocks of North America.
36.
_Licrophycus Ottawaensis_.
37.
_Astylospongia proemorsa_.
38.
_Stromatopora rugosa_.
39.
_Dichograptus octobrachiatus_.
40.
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