Deeds and documents, 1598-1856, mostly assignments of mortgage and related bonds, concerning Dôl y Cae and other premises in the parish of Tal-y-llyn, including a lease from William Owen Pughe and his brother Richard to his son Aneurin Owen Pughe.

Papers of Sir Henry Haydn Jones comprising letters dealing with local government affairs, education, elections, local industries, agriculture, and other activities, 1899-1950; correspondence relating to a hymn and tune book compiled by him, 1915-1917; miscellaneous papers, 1836-1880, the earlier papers belonging to his father, J. D. Jones; notebooks containing sermon notes; papers relating to Towyn British School, 1858-1862; Ruthin British School visitors' books, 1849-1864; and papers relating to the Maesypandy and Ynysymaengwyn estates, 1858-1883, the Abergynolwyn Slate and Slab Company, 1924-1939, and the Talyllyn Railway, 1924, 1938-1949.

Rough notes on Talyllyn, Llanfihangel y Pennant, etc., including extracts from the Talyllyn parish register and notes on archaeology and nonconformity.

Deeds and documents of the Bennett family of Glanyrafon, Montgomeryshire, and the Owen family of Dolgoed and Llawrpenegoes, 1546-1946, relating mainly to properties in the parishes of Llanidloes, Llanwrin, Penegoes, and Trefeglwys, Montgomeryshire, and Talyllyn, Merionethshire; and a map of properties in Trefeglwys, 1819.