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A second supplement to, and summary of Stewart and Corry's flora of the North-east of Ireland - Corry, Thomas H. (Thomas Hughes), 1859 -1883 (Belfast Naturalists' Field Club, 1923)

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Seed list : a list of forage plant seeds and the incidental seeds commonly found with them - Hillman, F. H. (Division of Seed Investigations, Bureau of Plant Industry, U.S. Dept. of Agriculture, 1935)

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