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Clouston, J. Storer (ed.). Records of the earldom of Orkney, 1299-1614. Edinburg...
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Clouston, J. Storer (ed.). Records of the earldom of Orkney, 1299-1614. Edinburgh: T. And A. Constable for the Scottish History Society (1914), 2nd ser, vol. 7, pp. 21-28 (Charter to David).