Papers of D. A. Thomas, Viscount Rhondda, including letters to D. A. Thomas on political matters such as working conditions in the mining industry, education, church disestablishment, and the temperance movement, 1891-1910 (mainly 1891-1895); drafts and copies of letters from D. A. Thomas on similar subjects, 1891-1895; miscellaneous letters, 1893-1895; subject files, 1874-1917, on the coal industry, including the Cambrian Navigation Collieries, the Mining Association of Great Britain, the South Wales Liberal Federation, temperance and disestablishment; scrapbooks of press cuttings, 1894-1927, relating to Cymru Fydd, D.A Thomas, Merthyr politics and Keir Hardie, the Lusitania, and Lady Rhondda; miscellaneous items, 1897-1934, including genealogical material and congratulatory addresses to D.A.T.; circulars and memoranda.