Gohebiaeth ganolog dwy adran yr Academi / General correspondence relating to work common to both sections of the Academi, (Cyfieithu ar y pryd / Simultanious translation) 1978-1983.
Gohebiaeth ganolog dwy adran yr Academi / General correspondence relating to the work of both sections of the Academy, (Darlledu/Broadcasting), 1981 & 1985.
Gohebiaeth ganolog dwy adran yr Academi / General correspondence relating to the work of both sections of the Academi, (Association for Business Sponsorship of the Arts), 1987-1988