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Billings, E. (1860). Description of some new species of fossils from the lower and middle Silurian rocks of Canada. The Canadian Naturalist and Geologist. 5: 49-69.
467358
Billings, E.
1860
Description of some new species of fossils from the lower and middle Silurian rocks of Canada
The Canadian Naturalist and Geologist
5: 49-69
Publication
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