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Please see Darrell Wolcott: Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, June 11, 2021.)
Please see Darrell Wolcott: Foundations of 'The Men of the North' - Part 1; http://www.ancientwalesstudies.org/id278.html. (Steven Ferry, July 2, 2021.)