Some peculiar spiral fossil forms from California and Mexico

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Mansfield, Wendell C. 1930. "<a href="https://repository.si.edu/handle/10088/21544">Some peculiar spiral fossil forms from California and Mexico</a>." <em>Proceedings of the United States National Museum</em>, 77, (2836) 1–3, 2 pls.. <a href="https://doi.org/10.5479/si.00963801.77-2836.1">https://doi.org/10.5479/si.00963801.77-2836.1</a>.

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