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Biostratigraphy of the Cambrian-Ordovician Transition in the Bear River Range, Utah and Idaho, Western United States, in: , The Cambrianordovician Boundary: Sections, Correlations, Fossil Distributions, And Correlations. National Museum of Wales, pp. 131-139., 1982.
Cambrian-Ordovician Boundary Sections in the Cow Head Group, Western Newfoundland, in: , The Cambrian-Ordovician Boundary: Sections, Fossil Distributions, And Correlations. National Museum of Wales, pp. 95-129., 1982.