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Amgueddfa Cymru – Museum Wales
Full title - Formal Opening of New Slate Making and Architectural Departments by The Right Honourable Cledwyn Hughes, M.P. Secretary of State for Wales Friday, 9th June 1967. Penrhyn Quarries Ltd. 1 sheet paper folded in half and printed on three sides. Photograph on front. Gives brief history and statistics of quarry.
