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Simpson, H.F.M. 1895. Notes on a Swedish Staff-Calendar, Presented to the Museum by The Hon. John Abercrombie, F.S.A. Scot., dated 1710. Proceedings of the Society of Antiquaries of Scotland. 29, (Nov. 1895), 234–240. DOI:https://doi.org/10.9750/PSAS.029.234.240.