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book written by Malcolm McKenna et Susan K. Bell (1997)

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scholarly article by Donald Lofgren et al published 6 February 2014 in American Museum Novitates

scientific article published in 1963

scientific article published in 1962

scientific article published in 1961

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scientific article published in 1965

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scholarly article by Malcolm McKenna published 1966 in American Museum Novitates

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scientific article published in 1959