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Riedel, A. (1980). Genera Zonitidarum. Diagnosen supraspezifischer Taxa der Familie Zonitidae (Gastropoda, Stylommatophora), 197 pp. [< 28 March].
Riedel, A. (1980). Genera Zonitidarum. Diagnosen supraspezifischer Taxa der Familie Zonitidae (Gastropoda, Stylommatophora), 197 pp. [< 28 March].
