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PALAEONTOLOGY: 
Yol. Y. Part I. 
LAMELLIBRANCHIATA 
I. 
TEXT -A-DSTID PLATES. 
CONTAINING DESCRIPTIONS AND FIGURES 
OF THE 
MONOMYARIA 
OF THE 
UPPER HELDERBERG, HAMILTON AND CHEMUNG GROUPS. 
By JAMES HALL, 
STATE GEOLOGIST. 
ALBANY, N. Y.: 
CHARLES VAN BENTHUYSEN & SONS. 
1884. 
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