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PALAEONTOLOGY 
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Vol. V. Part II. 
TEXT. 
CONTAINING DESCRIPTIONS OF THE 
GASTEROPODA, PTEROPODA AND CEPHALOPODA 
OF THE 
UPPER HELDERBERG, HAMILTON, PORTAGE AND CHEMUNG GROUPS. 
By JAMES HALL, 
STATE GEOLOGIST. 
ALBANY, N. Y.: 
CHARLES VAN BENTHUYSEN & SONS. 
1879. 
