The papers comprise correspondence, drafts, typescripts, research material and photographs for Souter's published works: New Guinea: the last unknown, Lion and kangaroo: the initiation of Australia, 1909-1919, Acts of Parliament: a narrative history of the Senate and House of Representatives Commonwealth of Australia, Company of Heralds: a century and a half of Australian publishing by John Fairfax Limited and its predecessors, 1831-1981 and Heralds and angels: the house of Fairfax 1841-1990.
Papers contain correspondence for the years 1959 to 1963, research notes handwritten by Souter, typescripts, press cuttings, photographs and some publications relating with West New Guinea and the Netherlands.