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Amgueddfa Cymru – Museum Wales
Typed in black ink on off-white, company headed paper. Two-page letter from The British (Guest Keen Baldwins) Iron & Steel Co. Ltd., East Moors, Cardiff to W. E. Simons at Margam Works. Letter regarding the burden at Margam furnaces, which showed that the yield of ore fluctuated from 35.4 cwts to 36.4 cwts in a week. Dated 12th November 1930.
