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By: Hughes, Nigel CEdition:Publication info: Washington, D.C, Smithsonian Institution Press, 1994Volume: no.79 (1994)Series:Holding Institution: Smithsonian Libraries and ArchivesSubjects: Animals, Fossil Cambrian Dikelocephalus Mississippi River Valley PaleontologyBHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection