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Paleozoic Era

  1. The Coal Measures Amphibia of North America
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    Roy Lee Moodie
    The Coal Measures Amphibia of North America
  2. The Appendages, Anatomy, and Relationships of Trilobites
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    Percy E. Raymond
    The Appendages, Anatomy, and Relationships of Trilobites

  3. Two New Pelycosaurs from the Lower Permian of Oklahoma

    Richard C. Fox

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    Richard C. Fox
    Two New Pelycosaurs from the Lower Permian of Oklahoma
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