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Llanberis (Dinorwic) Slate Quarry Mueum. Museum Upper Level Water Wheel. Sheet 3 of 7. Date of Survey July 1976. Surveyed by Plowman Craven & Associates on behalf of Central Survey, DCED. Survey Job No. 24694. Scale 1:100, drawn by P.C.A Checked F.J.T with location plan 1:2500
