- NLW ex 1701.
- Ffeil
Typescript copies of Edward G. Williams' corrections and amendments regarding information concerning the Rees families of Y Werfa, Aberdâr, and Tir y Cwrt, Merthyr Tudful, contained in W. W. Price's biographical index and in T. V. Davies, 'The farms and farmers of Senghenydd Supra prior to the industrial revolution' (part 1, 'Merthyr parish').