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Published online by Cambridge University Press: 01 May 2009
page 384 note 1 Dewey, H. and Dines, H. G., Mem. Geol. Survey, Survey, Special Reports on the Mineral Resources of Great Britain,vol. i, Tungsten and Manganese Ores; 3rd edit., 1923, p. 63 Google Scholar
page 384 note 2 Geology of the Dolgelley District, Merionethshire, Proc. Geol Assoc, vol. xxxviii, 1927, p. 270.Google Scholar