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Calder, C.S.T. and Steer, K.A. 1951. Dun Lagaidh and four other prehistoric monuments near Ullapool, Ross and Cromarty. Proceedings of the Society of Antiquaries of Scotland. 83, (Nov. 1951), 68–76. DOI:https://doi.org/10.9750/PSAS.083.68.76.