The beach of Falesá : : opera in three acts, [op. 83],
Full and vocal scores, a pencil sketch, and a synopsis of the opera; together with copies of the libretto and related letters from Glyn Jones.
libretto by Glyn Jones, based on a short story by R. L. Stevenson.
The Rajah's diamond : : an opera in one act, op. 99,
Scores, pencil sketch and libretto.
libretto by Myfanwy Piper, based on a story by R. L. Stevenson.
R. L. Stevenson: Ynys y Trysor,
A volume containing a translation into Welsh by Philip Thomas of R. L. Stevenson, Treasure Island (London, 1883), submitted for competition at the National Eisteddfod of Wales, Barry, 1920, under the pseudonym 'Dyn yr Ynys'.
Philip Thomas.
R. L. Stevenson: Ynys y Trysor,
An exercise book containing a draft, 1920, of chapters 27-31 of MS 13742C.
Philip Thomas.