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Dall, W. H. & Ochsner, W. H. (1928). Landshells of the Galapagos Islands. Proceedings of the California Academy of Sciences. ser. 4, 17: 141-185.
Dall, W. H. & Ochsner, W. H. (1928). Landshells of the Galapagos Islands. Proceedings of the California Academy of Sciences. ser. 4, 17: 141-185.
