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Amgueddfa Cymru – Museum Wales
A page of test data and a two-page cover letter, attached with a paperclip. Test results showing analyses of pyrites recieved from T.E. Evans & Co. Typed in black ink on cream paper. Also a cover letter, addressed to A.S. Davies of Port Talbot Works re. the results. Dated 16th October, ???4 (full year not stated.)
