Tetrapods of the Pennsylvanian nodules from Mazon Creek, Illinois

Joseph Tracy Gregory

doi:10.2475/ajs.248.12.833

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Gregory, J. T. (1950). Tetrapods of the Pennsylvanian nodules from Mazon Creek, Illinois. American Journal of Science, 248(12), 833–873. https://doi.org/10.2475/ajs.248.12.833

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Tetrapods of the Pennsylvanian Nodules From Mazon Creek, Illinois