Plates, containing figures of the gasteropoda, pteropoda and cephalopoda of the upper Helderberg, Hamilton, Portage and Chemung groups.
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Plates, containing figures of the gasteropoda, pteropoda and cephalopoda of the upper Helderberg, Hamilton, Portage and Chemung groups.
（Natural history of New York, . Palæontology ; v. 5,
Charles Van Benthuysen & Sons, 1879
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Note
At head of title: Geological Survey of the State of New York
Includes index