Manuscripts collected by, and papers of, the Rev. T. Llechid Jones, including personal correspondence, 1883-1943; miscellaneous correspondence, 1826-1907; diaries, 1888-1935; addresses, 1911-1937; miscellaneous notes, 1888-1941; antiquarian notes, 1700-1943, mainly relating to parishes in North Wales; press cuttings, 1890-1934; pedigrees, genealogical material and correspondence of H. R. Hughes, 1867-1920; deeds and documents relating to Llysfaen, Caernarfonshire, and elswhere, 1597-1880; and printed books, with manuscript notes, 1678-1937.

Miscellaneous deeds and documents, mainly relating to properties in co. Card., 1675-1902, co. Caern, 1546-1860, co. Carm., 1702-1914, co. Denb., 1575-1850, co. Flint, 1770-1776, co. Glam., [13 cent.?]-1924, co. Mer., 1598-1890, co. Mont., 1465-1877, co. Mon., 1630-1775, co. Pemb., 1753-1930, co. Rad., 1706-1840, Cheshire, 1703-1789, Gloucestershire, 1656-1788, Herefordshire, 1594-1772, Shropshire, 1710-1809, and Ireland, 1671-1922.