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Horsburgh, J. 1867. Notes of Cromlechs, Duns, Hut-Circles, Chambered Cairns, and other Remains, in the County of Sutherland. Proceedings of the Society of Antiquaries of Scotland. 7, (Nov. 1867), 271–279. DOI:https://doi.org/10.9750/PSAS.007.271.279.