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George Brettingham Sowerby III (16 September 1843 – 31 January 1921) was a British conchologist, publisher, and illustrator.
He, too, worked (like his father George Brettingham Sowerby II and his grandfather George Brettingham Sowerby I) on the Thesaurus Conchyliorium, a comprehensive, beautifully illustrated work on molluscs. He was colour blind, and thus his daughter did most of the colouring of his engravings.