Letter, 9 November 1928, Surrey, Robert Trevelyan to Charles Ricketts. Agreeing to pay Ricketts three hundred pounds for his work on the ' Bride of Dionysus' sets. Holograph unfinished.

Letter, 29 January 1929, Surrey, Robert Trevelyan to Charles Guthrie Esq.. Discussion of the performance of the opera and the financial and legal considerations. Typescript copy.

Letter, 11 July 1940, Surrey, Robert Trevelyan to Clara Tovey. Expressing grief and sympathy after the death of Tovey. Holograph signed, with envelope.

Letter, [n.d], William Strecker to Robert Trevelyan. Thanking Trevelyan for writing, discussion of Tovey's completion of the opera, offering help with the production of the opera, news that Strecker is tired of his imprisonment. Holograph signed, written on German Prisoner of War notepaper, with a postmark, Alexandra Palace.

Letter, 30 July 1907, Surrey, Robert Trevelyan to Donald Tovey. A speech for Minos, part of the script of The Bride of Dionysus. Holograph.

Letter, 31 July 1907, Surrey, Robert Trevelyan to Donald Tovey. Detailed plans and notes for the script of ' The Bride of Dionysus'. Holograph signed.

Letter, 21 September 1907, Surrey, Robert Trevelyan to Donald Tovey. Suggestion in chart form for the ensemble and comments on the progress of ' The Bride of Dionysus'. Holograph signed.

Letter, 27 September 1907, Surrey, Robert Trevelyan to Donald Tovey. A proposed correction for Act II scene I, and detailed plans for the opera. Holograph signed.

Letter, 3 September 1907, Surrey, Robert Trevelyan to Donald Tovey. Thanking Tovey for his letter, discussing alterations to ' The Bride of Dionysus' script. Holograph incomplete.

Letter, [1908], Robert Trevelyan to Donald Tovey. Requesting that Tovey demonstrate a common courtesy, and pointing out Miss. Weisse's failings. Holograph signed.