Papers of, or collected by, Evan William Evans, Dolgellau, 1808-[1921x1925], consisting mainly of material of Dolgellau local historical and religious interest, including rate assessments and valuations, accounts, rentals, chapel records and other records, 1813-1877; agricultural, timber, slate and other account books, 1823-1879; papers of T. Mordaf Pierce, including correspondence, essays, sermons and material relating to Dolgellau history, 1894-1914; material relating to Calvinistic Methodism in Llanidloes and Dolgellau, 1808-1918; and correspondence, 1850-1921, mainly addressed to Evans.

Notes relating to the social and religious history of Dolgellau copied from various sources by T. Mordaf Pierce.