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Gittenberger, E. & Manga, M. Y. (1981). A new Helicella (Helicidae, Helicellinae) from Navarra, Spain. Basteria. 45 (4/5): 121-124. Leiden.
Gittenberger, E. & Manga, M. Y. (1981). A new Helicella (Helicidae, Helicellinae) from Navarra, Spain. Basteria. 45 (4/5): 121-124. Leiden.