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Munro, R. and Abercromby, J. 1904. Notes on Primitive Stone Structures of the Beehive Type, discovered by R.C. Haldane, Esq., in the North of Shetland. Proceedings of the Society of Antiquaries of Scotland. 38, (Nov. 1904), 548–558. DOI:https://doi.org/10.9750/PSAS.038.548.558.