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Edwards, A. and Bryce, T. 1927. Excavation of Graves at Ackergill and of an Earth-house at Freswick Links, Caithness, and a Description of the Discovery of a Viking Grave at Reay, Caithness. Proceedings of the Society of Antiquaries of Scotland. 61, (Nov. 1927), 196-209. DOI:https://doi.org/10.9750/PSAS.061.196.209.