Correspondence, diaries, notebooks, personal documents, newspaper cuttings, photographs, printed ephemera, research materials and manuscripts and typescripts of Clark's books, articles, reviews, lectures, addresses and speeches. There are some papers relating to Clark's teachings at the Australian National University, but the bulk of the collection comprises private papers, providing a detailed record of his ideas and thoughts, his friendships, his travels, his participation in public debates and discussions and the whole range of his writings. Series 16-18, occupying 102 boxes, relate to "A history of Australia", including the original manuscripts and typescripts, research materials, reviews and correspondence with publishers, friends and readers. The correspondence mostly dates from 1950 to 1991 and is very extensive. The correspondents include Kathleen Fitzpatrick, Geoffrey Fairbairn, James McAuley, R. M. Crawford, John La Nauze, Sir Keith Hancock, Geoffrey Dutton, Russel Ward, John Ritchie, Don Baker, G. P. Shaw, Bruce Grant, Judah Waten, Patrick White, Ken Inglis, John Ritchie, Lyndall Ryan, Suzanne Welborn, Humphrey McQueen, Pat Dobrez and Helen Garner.
