The series comprises correspondence and papers, 1946-1974, relating to Goronwy O. Roberts's work as Labour Member of Parliament for Caernarfonshire. They include letters from constituents asking for assistance and advice and drawing attention to problems and difficulties in the constituency, responses from government departments and ministries, letters concerning local events and activities, letters from organisations and societies within the county, and correspondence deriving from local government matters. The constituency correspondence is especially revealing in so far as it reflects local expectations from the Labour governments, 1945-1951, and later administrations.

The series comprises files of correspondence and papers, 1940-1974, concerning Caernarfonshire subjects or themes.