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Thomas, F.W.L. and Muir, T.S. 1891. Notices of Three Churches in North Uist, Benbecula, and Grimsay, said to have been built in the Fourteenth Century. With Descriptions and Plans of Primitive Chapels in Rona and Sula Sgeir. Archaeologia Scotica. 5, (Nov. 1891), 225–248.