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Amgueddfa Cymru – Museum Wales
Plan ’The Tirpentwys Black Vein Steam Coal and Coke Co. Ltd Proposed Water Adit from Tirpentwys Colliery to Glyn Valley’. 2 Chains to 1 inch horizontal scale and vertical scale 60 feet to an inch. Dated 1922. Shows progress reports on the drivages for water drainage from Tirpentwys Colliery which details the lack of progress due to the 1921 coal strike.
