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Joass, J.M. and Aitken, T. 1891. The Brochs or Pictish Towers of Cinn-Trolla, Carn-Liath, and Craig-Carril, in Sutherland, with Notes on other Northern Brochs. With Report upon the Crania found in and about them. Archaeologia Scotica. 5, (Nov. 1891), 95-130.