'1253, membranes 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10', in Calendar of Pat...

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'1253, membranes 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10', in Calendar of Patent Rolls, Henry III: Volume 4, 1247-1258, ed. H C Maxwell Lyte (London, 1908), pp. 160-195, British History Online, entry for 20 January 1253, accessed 5 October 2021

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