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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 10 March, 1908.
