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Rosenberg, G.; Petit, R. E. (1987). Ryckholt's Mélanges Paléontologiques, 1851-1862, with a new name for Tudicula H. & A. Adams, non Ryckholt. Proceedings of the Academy of Natural Sciences of Philadelphia. 139: 53-64.
Rosenberg, G.; Petit, R. E. (1987). Ryckholt's Mélanges Paléontologiques, 1851-1862, with a new name for Tudicula H. & A. Adams, non Ryckholt. Proceedings of the Academy of Natural Sciences of Philadelphia. 139: 53-64.
