The correspondence, [?1888]-1942, includes letters to John Griffith from H. Graham Dakyns (including one to his brother, J. R. Dakyns), 1910-1911, and Sir Walford Davies, [?1919]-1933; letters from John Griffith to J. Breese Davies, 1912-1930, and a related letter, 1942, from L. A. Breese Davies to Wyn Griffith.
Transcripts by Wyn Griffith of John Griffith's diaries, Nov. 1916-Feb. 1918; and a few diary entries in John Griffith's hand, 1927-1931, relating mainly to family, friends, and musical topics. A photograph of Watcyn, Wyn Griffith's brother who died in Mametz Wood in 1916, is also included.
A few hymns, carols and songs, being mainly arrangements by John Griffith, including a bound volume containing arrangements, [?1891], of two carols dedicated to May Hughes, entitled 'Carol Fair' (arrangement and words by John Griffith) and 'Wel dyma foreu'. A copy of Cân Miriam: i soprano solo a chydgan. Cyfansoddwyd gan Franz Schubert. Y geiriau gan J. Griffith. Trowyd i nodiant solffa gan W. G McNaught (London, [c. 1903]), is also included.
Letters, 1934, from Sir Walford Davies and T. Gwynn Jones, relating to Walford Davies's composition written as a memorial to John Griffith, and published as Ah! gentle may I lay me down. Words taken from William Blake and Edmund Prys (Cardiff, 1934).
Personal and miscellaneous papers, 1935-1950, including a copy of his birth certificate; Army Book, 1939-1941; and photographs and correspondence, 1944-1950, relating to his grave in Hamburg, Germany.
Correspondence, 1945-1951, between John Griffith's cousin, Rowland Williams, and Wyn Griffith, following the latter's request for information regarding the family history; together with three exercise books, one containing an autobiography of Rowland Williams, dated April 1946, and the others containing miscellaneous notes, 1945-1948. A few pedigree charts are also included.
Miscellaneous documents, 1850-1916, including deeds, 1867 and 1877, relating to properties in the parish of Llanfaelrhys, co. Caernarvon, and copies (extracted 1916) of the wills of Henry Williams and William Parry, both of Ty Isaf in the parish of Rhiw, co. Caernarvon, proved 22 May 1850 and 5 March 1855 respectively.
Autograph copy of what Wyn Griffith describes as 'the starting point of what became Up to Mametz', an account of his experiences during the 38th (Welsh) Division's attempts to capture Mametz Wood in July 1916. The work was published in 1931.
An autograph copy, [?1935], of a 'continuation of Spring of Youth', a description of Wyn Griffith's childhood in Wales; together with a broadsheet produced by the publishers, Constable & Co. Ltd.
Incomplete manuscript draft of an untitled work, headed 'Llwyntalcen 15 June '46', opening with the words, 'The shop was closed, the shutters down, and the long counters stretched out naked towards the front windows'.
A notebook containing the manuscript of a short story entitled 'Y Dyn Diarth', dated 8 August 1947. The story was published in Y Fflam, vol. 1, no. 4 (1947).