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Sawyer, Roy T. (1972). North American freshwater leeches, exclusive of the Piscicolidae, with a key to all species. Illinois Biological Monographs. 46: 1-155.
Sawyer, Roy T. (1972). North American freshwater leeches, exclusive of the Piscicolidae, with a key to all species. Illinois Biological Monographs. 46: 1-155.