Walcott C.D. (1886). Second contribution to the studies on the Cambrian faunas of North America. <em>United States Geological Survey Bulletin.</em> 30: 1-365.[details]
original descriptionWalcott C.D. (1886). Second contribution to the studies on the Cambrian faunas of North America. <em>United States Geological Survey Bulletin.</em> 30: 1-365.[details]
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