LANDMAN, NEIL H. & COBBAN, WILLIAM A., 2003, Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado

LANDMAN, NEIL H. & COBBAN, WILLIAM A., 2003, Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado, American Museum Novitates 3388, pp. 1-46

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https://doi.org/10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2

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https://doi.org/10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2

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