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![](./img/clear.gif) 1.- Ordovician (Caradoc) marginal basin volcanism in Snowdonia (north-west Wales)
Howells, M.F., ed.; Campbell, S.D.G., ed.; Reedman, A.J., ed.; British Geological Survey, ed.
London: BGS, 1991
Geología
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![](./img/clear.gif) 2.- Snowdonia
Howells, M.F.; Leveridge, B.E; Reedman, A.J.
London: Unwin Paperbacks, 1981
Rocks and fossils
IV/8-8-38
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