Author: JONES, O.T. & W.J. PUGH
Title: The geology of the district around Machynlleth and the Llyfnabnt Valley.
Description: 1916. Quart. J. Geol. Soc. LXXI (282); pp. 343-385, 11 fig. 1 plt. h.t. with col. geol. map folding-out. Orig. extract, stapled, very good.

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