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Simpson, W.D. 1926. Notes on Lulach’s Stone, Kildrummy, Aberdeenshire; a Symbol Stone recently found in Mortlach Churchyard, Banffshire; and other Antiquities. Proceedings of the Society of Antiquaries of Scotland. 60, (Nov. 1926), 273–280. DOI:https://doi.org/10.9750/PSAS.060.273.280.