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By: Slocom, Arthur Ware, - Farrington, Oliver C. (Oliver Cummings), - Field Museum of Natural History.Edition:Publication info: Chicago, Field Museum of Natural History, 1913Volume: v.4:no.3 (1913)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Fayette County Iowa Ordovician Paleontology TrilobitesBHL Collections: