Miscellaneous papers in Welsh and English, 1822-[c.1950], mainly of Merthyr Tudful interest, accumulated by Elias Thomas, comprising poems and essays by his great-grandfather Rowland Thomas ('Idris Ddu'), his grandfather, William R. Thomas, and others, including an essay on the origin of the Cyfarthfa Ironworks by Rowland Thomas, with a translation of the same by Thomas Stephens (1821-75) of Merthyr; draft letters, articles and notes by Thomas Stephens; printed rules, 1846, of 'Cymdeithas Cadarn Graig y Cymry', Merthyr; and miscellaneous notes and press cuttings.