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Amgueddfa Cymru – Museum Wales
'Plan Shewing Position of Shafts. Scale About 3 inches = 1 mile' and 'Elevation Shewing Relative Depths of Shafts. Vertical Scale 1 inch = 200 Feet'. Longitudinal S-N section and plan of proposed Milwr Tunnel. Drawn in pen and ink with some colour washes.
