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Anderson, J. 1901. Notices of Nine Brochs along the Caithness Coast from Keiss Bay to Skirza Head, excavated by Sir Francis Tress Barry, Bart., M.P., of Keiss Castle, Caithness. Proceedings of the Society of Antiquaries of Scotland. 35, (Nov. 1901), 112–148. DOI:https://doi.org/10.9750/PSAS.035.112.148.