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: Geological Maps & Plans
: Geological Survey of Great Britain No. 28
: Four Horizontal cross sections from Llanfair-is-gaer, Menai straits, Cambrian and Silurian rocks of Snowdonia.
: Geological survey office
: 1853: United Kingdom of Great Britain and Northern Ireland (UK) / Wales, Northern Europe, Europe
: Llanfair-is-gaer, Menai straits