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Holland, C. H.; Copper, P. (2008). Ordovician and Silurian nautiloid cephalopods from Anticosti Island: traject across the Ordovician–Silurian (O–S) mass extinction boundary. Canadian Journal of Earth Sciences. 45(9): 1015-1038.
Holland, C. H.; Copper, P. (2008). Ordovician and Silurian nautiloid cephalopods from Anticosti Island: traject across the Ordovician–Silurian (O–S) mass extinction boundary. Canadian Journal of Earth Sciences. 45(9): 1015-1038.