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Amgueddfa Cymru – Museum Wales
Black print on cream paper with typed details in blue ink. The Monmouthshire & South Wales Coal Owners' Association certificate to Thomas Williams & Sons certifying that the proposal for the revision of assurance had been considered and approved by the Association for the collieries of Morlais, Talyclun, Grovesend and Brynlliw. Dated 9 March, 1909.
