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cranium

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    A young tortoise, Chrysemys picta, with two heads
    E. H. Barbour
    American Journal of Science October 1888, s3-36 (214) 227-230; DOI: https://doi.org/10.2475/ajs.s3-36.214.227
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    On an anatomical peculiarity by which crania of the mound-builders may be distinguished from those of the modern Indians
    W. J. McGee
    American Journal of Science December 1878, s3-16 (96) 458-461; DOI: https://doi.org/10.2475/ajs.s3-16.96.458
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    Note on the development and homologies of the anterior brain-mass with sharks and skates
    B. G. Wilder
    American Journal of Science August 1876, s3-12 (68) 103-105; DOI: https://doi.org/10.2475/ajs.s3-12.68.103

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