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Cal. Docs. Scot., vol. 4, Nos. 882 and 922, cited in MacGregor, Gordon. The Red ...
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Cal. Docs. Scot., vol. 4, Nos. 882 and 922, cited in MacGregor, Gordon. The Red Book of Scotland. Scotland: by the author (2016, 3rd ed. 2020), vol. 3, p. 597.