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Thom (2008). The First Vertebrates. Infobase Publishing. p. 64. ISBN 978-0-8160-5958-4. Rice, Stanley A. (2007). Encyclopedia of evolution. Infobase Publishing...129 KB (11,466 words) - 09:23, 17 November 2024
2008). The First Vertebrate. Chelsea House Publishers. p. 144. ISBN 9780816059584. Mulley, John F.; Chiu, Chi-hua; Holland, Peter W. H. (2006). "Breakup...61 KB (6,332 words) - 05:04, 13 November 2024
