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Malcolm, David, A Genealogical Memoir of the Most Noble and Ancient House of Dru...
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Malcolm, David, A Genealogical Memoir of the Most Noble and Ancient House of Drummond, and of the Several Branches that have Sprung from it, From its First Founder Maurice, to the Present Family of Perth, Edinburgh: Mundell, Doig & Stevenson, 1808, Archive.org, p. 45