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Amgueddfa Cymru – Museum Wales
Three pages pinned together. First page: Black print on white paper with handwritten details in black ink. Certificate to keep mixed explosives granted to Thomas Williams & Sons of Grovesend Colliery. Dated 23 May, 1905. Second page: Black print on cream paper with typed details in blue ink. Letter from Glamorgan Constabulary, Neath Police Office to Thomas Williams & Son re. the certificate. Dated June 6, 1905. Third page: Typed details in blue ink on white paper. Notice re. trespassing.
