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Hyman, L.H., 1929. Taxonomic studies on the Hydra of North America. I. General remarks and description of Hydra americana, new species. Trans. Am. microsc. Soc. 48 3: 242-255.
Hyman, L.H., 1929. Taxonomic studies on the Hydra of North America. I. General remarks and description of Hydra americana, new species. Trans. Am. microsc. Soc. 48 3: 242-255.
