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Say, T. 1824. Class Mollusca. Pp. 256-266. In Narrative of an expedition to the source of St. Peter's River, Lake Winnepeek, Lake of the Woods, &c. &c. performed in the year 1823, by order of The Hon. J.C. Calhoun, Secretary of War, under the command of Stephen H. Long, Major U. S. T. E. compiled from the notes of Major Long, Messrs Say, Keating, and Calhoun. Philadelphia, H. C. Carey & I. Lea. 459 pp.