Papers of Prof. Richard Aaron, 1904-1981, comprising drafts of Knowing and the Function of Reason (Oxford, 1971), and of 'Comte, Mill and Durkheim: the epistemological issues', [?1970s]; reviews of Aaron's published works and related material, 1936-1972; draft lectures, articles and teaching notes, 1956-1977; personal and family papers, 1904-1977; personal and academic correspondence, 1932-1976; correspondence relating to the resignation of Goronwy Rees as Principal of UCW, Aberystwyth, 1956; minutes, correspondence and papers relating to the Central Advisory Council for Education (Wales), 1946-1951, the Council for Wales and Monmouthshire, 1958-1963, and the BBC General Advisory Council, 1963-1971; discussion papers for meetings of the British Academy, 1980-1981; and papers relating to Welsh-medium higher education, 1955-1975. With the exception of Knowing and the Function of Reason, there appear to be no papers relating to his books.

Notebooks, 1920-1923, copy of thesis entitled 'Daearyddiaeth Hanesyddol ac Economig Cymru'; drafts of published works, including Saints, seaways and settlements in the Celtic lands (1969), Dewi Sant. Nawdd Sant Cymru / Saint David. Patron Saint of Wales (1983) and 'Distribution of the Crown Livings in England and Wales . . . 1539' (?unpublished); lecture notes when he was Gregynog Professor of Geography and Anthropology at UCW, Aberystwyth, 1947-1968; papers relating to United Theological College, 1976-1983; papers relating to the University of Wales, Aberystwyth, 1978-1983; correspondence addressed to him, 1925-1982; maps, diagrams and posters prepared by him [20th century]; and miscellaneous papers, 1924-1981.