Llythyr oddi wrth Y Parch J.J. Williams, Treforis, at Silyn,
Llythyr oddi wrth Evan Evans, Yr Ysgwrn, at Silyn,
Llythyr oddi wrth Y Parch. J.J. Williams at Silyn,
Llythyr oddi wrth Elizabeth Williams, o Poperinghe, at Silyn,
Llythyr copi oddi wrth Silyn at Evan Jones, Trawsfynydd,
Llythyr oddi wrth J. R. Jones, Trawsfynydd, at Silyn,
Llythyr oddi wrth Silyn at 'Ex Sergeant Idwal Williams, Penmorfa,
Recruiting poster entitled 'Y darn papur',
'Rhiwle yn Ffrainc' written by Hedd Wyn,
Royal Welsh Fusiliers' War Diaries,
Royal Welsh Fusiliers' War Diaries,
War diary of the 14th (Service) Battalion, Royal Welsh Fusiliers,
War diary of the 14th (Service) Battalion, Royal Welsh Fusiliers,
Sir John Morris-Jones Papers,
Sir John Morris-Jones Papers,
An appeal made during the Great War, entitled ‘At y Cymry’ by John Morris-Jones,
'Yr Arwr' by Hedd Wyn,
