1976. Letter from Edinburgh Arts 1976 participant Joan Hughson to Lady Jean Polwarth (RDG Board of Directors), ref. Edinburgh Arts 1976.
1980. Edinburgh Arts participants at Knowth, neolithic passage tombs, County Meath, Eire. Edinburgh Arts 1980.
1971. Letter from Demarco to Mark Goldberg (RDG Board member). Ref. forthcoming Ian Hamilton Finlay exhibition at the RDG (December 1971)