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Gittenberger, E. & Manga, M. Y. (1977). Some new species of the genus Helicella (Pulmonata, Helicidae) from the province León, Spain. Zoologische Mededelingen. 51 (11): 177-189, pl. 1-2. Leiden [26 April].
Gittenberger, E. & Manga, M. Y. (1977). Some new species of the genus Helicella (Pulmonata, Helicidae) from the province León, Spain. Zoologische Mededelingen. 51 (11): 177-189, pl. 1-2. Leiden [26 April].
