Correspondence relating to advertising, Ychwanegu i'r clipfwrdd GF/A5. Ffeil 1962-6. Rhan oWelsh National Opera Records
Addressograph - Multigraph Limited, correspondence with, Ychwanegu i'r clipfwrdd GF/A94. Ffeil 1964-74. Rhan oWelsh National Opera Records Addressograph - Multigraph Limited, correspondence with, 1964-74.
Advertisement and Souvenir Programme for the 1967 Wi Gala Performance, correspondence relating to, Ychwanegu i'r clipfwrdd GF/A28. Ffeil 1967. Rhan oWelsh National Opera Records