Letters calling Rowland Williams ('Hwfa Môn') to the pastorates of the following churches: Abersoch, Bwlchtocyn and Capel Newydd, 1849; Bethel, Bangor, 1851, Bagillt and Flint, 1851, Great Jackson Street, Hulme, Manchester, 1852, Bryn Sion, Brymbo, 1855, Newmarket, 1858, Bethesda, 1862, Fetter Lane, London, 1867 (with a list of members), Amlwch, 1870, Hyde Park, U.S.A., 1871, Park Road, Liverpool, 1875, Pendref and Bryn Seion, Ruthin, 1877, Llanerchymedd and Hebron, Maenaddfwyn, 1881, and Llangollen and Trefor, 1887.

Papurau, 1831, 1838 a 1926-1927, yn ymwneud â Chapel yr Annibynwyr, Rhuthun, a Chymdeithas Gymraeg Rhuthun a'r Cylch. = Papers, 1831, 1838 and 1936-1927, relating to the Congregational Chapel, Ruthin, and the Ruthin and District Welsh Society.
Maent yn cynnwys nodiadau o bregeth, 1831, gan y Parch. William Williams, y Wern (ff. 1-2); llythyr, 1838, yn gwahodd y Parch. Richard Jones, Aberhosan, i ddod yn weinidog ar Gapel yr Annibynwyr, Heol y Ffynnon, Rhuthun (ff. 3-4); a derbyniadau a thaliadau, 1926-1927, Cymdeithas Gymraeg Rhuthun a'r Cylch (f. 5). = The papers consist of notes on a sermon, 1831, by the Rev. William Williams, Wern (ff. 1-2); a letter, 1838, inviting the Rev. Richard Jones, Aberhosan, to become minister of the Congregational Chapel, Well Street, Ruthin (ff. 3-4); and receipts and payments, 1926-1927, of the Ruthin and District Welsh Society (f. 5).