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Munch, P.A. and Laing, D. 1862. Concordia facta inter Anglicos et Scotos, 3d January 1322-3: Communicated in a Letter from Professor Munch to David Laing. Proceedings of the Society of Antiquaries of Scotland. 3, (Nov. 1862), 454–464. DOI:https://doi.org/10.9750/PSAS.003.454.464.