[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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_Orthoceras crebriseptum_.
56.
Restoration of _Orthoceras_.
57.
Generalised section of the Upper Silurian rocks.
58.
_Monograptus priodon_.
59.
_Halysites catenularia_ and _H.
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