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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, 1987

University of Wales. Board of Celtic Studies, Ford, Patrick K., 1992

University of Wales. Board of Celtic Studies, Iorwerth Fynglwyd, Rowlands, Eurys Ionor, Jones, Howell Llewellyn, 1975

University of Wales. Board of Celtic Studies, Jones, Islwyn, Cilan, Hywel, 1963

University of Wales. Board of Celtic Studies, Morris-Jones, Huw, University of Wales. Pwyllgor Termau Technegol, 1976

University of Wales. Board of Celtic Studies, Evans, D. Simon (Daniel Simon), 1921-, 1977

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

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

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