Walcott, C. D. (1908). Cambrian sections of the Cordilleran area. In: Cambrian geology and paleontology. I. Smithsonian Miscellaneous Collections. 53(5): 167-230.
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Walcott, C. D.
1908
Cambrian sections of the Cordilleran area. In: Cambrian geology and paleontology. I.