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Bridge, J. & Cloud D. E. (1947). New gastropods and trilobites critical in the correlation of Lower Ordovician rocks. American Journal of Science. 245(9): 545-559.
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Bridge, J. & Cloud D. E.
1947
New gastropods and trilobites critical in the correlation of Lower Ordovician rocks
American Journal of Science
245(9): 545-559
Publication
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