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Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1991

Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1988

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Day, Graham, University of Wales. Board of Celtic Studies, Rees, Gareth, Read, Martin, 1987

University of Wales. Board of Celtic Studies, Rhygyfarch, 1056-1099, James, J. W. (John Williams), 1967