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Malcolm Fletcher Howells
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Ordovician ash-flow tuffs in eastern Snowdonia [by] M.F. Howells, B.E. Leveridge and C.D.R. Evans
Malcolm Fletcher Howells · H.M.S.O.
33 sayfa · 1973
Geology, Stratigraphic / Snowdonia / Stratigraphic Geology / Volcanic ash, tuff / Volcanism