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North, F.J. (1956). ‘The Geological History of Brecknock [Mid Wales]’ Reprint from Brycheiniog. v.1, National Museum of Wales,
North, F.J. (1956). ‘The Geological History of Brecknock [Mid Wales]’ Reprint from Brycheiniog. v.1, National Museum of Wales, 1956. pp. 9-77 + 2 photographic plates. In blue paper cover. Text age-toned and clean. . In good to very good condition.