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Amgueddfa Cymru – Museum Wales
Typed in black and red ink on off-white paper. Results of tests made with Oxfordshire fines at the Cardiff sinter plant. Sent from the blast furnace department at Guest Keen & Baldwins Iron & Steel Co. Ltd., East Moors Works to J.S. Holling (Joint Managing director at Port Talbot Works) Dated 22nd December 1937.
