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Verdcourt, B. (1983). The identity of Helix butumbiana von Martens (Pulmonata: Endodontidae sensu lato). Journal of Conchology. 31:179–183.
Verdcourt, B. (1983). The identity of Helix butumbiana von Martens (Pulmonata: Endodontidae sensu lato). Journal of Conchology. 31:179–183.
