- NLW MS 18404D.
- Ffeil
- 1897-1900.
Correspondence, mainly letters addressed to H. Humphries, Rhiwbach Slate Quarry, Blaenau Ffestiniog, together with copies of letters from Humphries. (Formerly Borth-y-gest MS 143.) English. In a file. Purchased from the library of Mr R. E. Jones, Borth-y-gest, 1959-1961.