Author: JONES, OWEN THOMAS
Title: The Hartfell-Valentian succession in the district around Plynlimon and Pont Erwyd (North Cardiganshire).
Description: 1909. Quarterly Journal of the Geological Society 65; pp. 463- 537, 17 fig. 2 plts. h.t. with maps folding-out. Plain wrps. stapled extract, very good.

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