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of Canada (1985), The Burgess Shale, Yale University Press, ISBN 978-0-660-11901-4, OCLC 15630217 Gould (1990), p. [page needed]. García-Bellido, D....

of Canada (1985). The Burgess Shale. Yale University Press. ISBN 978-0-660-11901-4. OCLC 15630217. Gould, S.J. (1989). Wonderful Life: The Burgess Shale...