The archive includes letters and greetings cards, 1953-1972, and correspondence and papers, 1966-1972, deriving from the many groups and societies with which Olwen Caradoc Evans was associated, including the steering committee of the Royal Cambrian Academy of Art and the Nant Conway Rural District Council. There are also family correspondence and papers, 1935-1945, and a file of personal correspondence, 1995-[1998]. There are also biographical and family papers, 1917-1941, research papers, 1904-1988, relating to the ancestry of Dr John Caeradoc Evans; research papers, 1846-1985, concerning the ancestry of Olwen Caradoc Evans herself; and press cuttings and photographs, 1967-1990. There are papers concerning 'Tu Hwnt i'r Bont', 1953-1959, notes relating to her research and business enterprises, 1960-1991, and printed material, 1952-1997.