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: Geological Maps & Plans
: Geological survey of Great Britain sheet 42 SW
: A map showing the geology of part of Brecon showing an area to the N of Penderyn including Fforest Fawr
: Ordnance Survey Office
: 01 Sep 1832: De la Beche, Sir H T.: United Kingdom of Great Britain and Northern Ireland (UK) / Wales, Northern Europe, Europe
: Part of Brecon showing an area to the north of Penderyn including Fforest Fawr