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Verdcourt, B. (1956). Notes on the snails of North East Tanganyika Territory 7. The variation of Gulella conradti (von Marts.) and the description of Gulella intrusa, a closely allied new species. Proceedings of the Malacological Society of London. 32(1-2): 69-71.
Verdcourt, B. (1956). Notes on the snails of North East Tanganyika Territory 7. The variation of Gulella conradti (von Marts.) and the description of Gulella intrusa, a closely allied new species. Proceedings of the Malacological Society of London. 32(1-2): 69-71.