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Barclay, G., Brooks, M. and Rideout, J. 1983. The cup and ring marked stone at Newbigging Farm, Perth & Kinross District, Tayside Region. Proceedings of the Society of Antiquaries of Scotland. 112, (Nov. 1983), 559-561. DOI:https://doi.org/10.9750/PSAS.112.559.561.