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Riedel, A. (1964). Zonitidae (Gastropoda) der Azoren. Bol. Mus. Municip. Funchal, 18: 5-60.
Riedel, A. (1964). Zonitidae (Gastropoda) der Azoren. Bol. Mus. Municip. Funchal, 18: 5-60.