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Joass, J.M. 1872. Notice of the Excavation of the Pictish Towers at Cinntrolla, Carnliath, and Craig-Carril in Sutherland, with Notes on Neighbouring Brochs; and an appended Report by T. Aitken, M.D., F.A.S.L., Inverness, on the Crania found in and about them. Proceedings of the Society of Antiquaries of Scotland. 9, (Nov. 1872), 60. DOI:https://doi.org/10.9750/PSAS.009.60.1.