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  1. Permian cephalopods of Kurosawa, Kesennuma City in the Southern Kitakami Massif, Northwest Japan
    By: Ehiro, Masayuki - Araki, Hideo
    Type: Article
    In: Paleontological Research
    Volume: 1
    Date: 1997
    Page Range: 55--66
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  2. Permian orthoconic cephalopods of the Ochiai Formation in the Southern Kitakami Mountains, Northeast Japan
    By: Niko, Shuji - Ehiro, Masayuki
    Type: Article
    In: Paleontological Research
    Volume: 6
    Date: 2002
    Page Range: 385--389
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  3. Some additional Wuchiapingian (Late Permian) ammonoids from the Southern Kitakami Massif, Northeast Japan
    By: Ehiro, Masayuki
    Type: Article
    In: Paleontological Research
    Volume: 5
    Date: 2001
    Page Range: 111--114
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