Literary notes and drafts of Anne McCosker's poems and stories, personal correspondence, research papers and correspondence relating to the history of Australian New Guinea before and after World War Two, World War One letters from Lieutenant F.W.S. (Fred) Martin, and photographs relating to Anne McCosker's family history in Australian New Guinea. Many of the letters, research documents and photographs relating to New Guinea were used as source material for Anne McCosker's book Masked Eden: A History of the Australians in New Guinea.

Scrapbook of articles by Stan McCosker as printed in The Bulletin. The articles contain descriptions and accounts of life in New Britain. At the back of the scrapbook there are four loose newspaper cuttings from the 1960s and a typed article, 'The Epistle of Father Jerome to the Kiaps'.

Typed and handwritten biographical information about Anne McCosker including notes on the biographical influences on her creative writing.

Business and personal correspondence of Stan McCosker, a copy of the certificate of marriage of Stanley McCosker and Marjorie Martin, a hand-drawn map of the boundaries of the Matala plantation and a newspaper cutting by Marjorie Martin about her life on Mingan in New Guinea. Correspondence includes four letters from Rombin to Stan McCosker. Rombin was one of McCosker's plantation employees.

Correspondence, statements and asset inventories relating to a claim to the War Damages Commission for war damage to the Matala Plantation during the Japanese military occupation of New Guinea.

Letters and cards received or written by Anne McCosker and letters collected by her and used as source material for her books about Lieutenant Frederick Martin and the history of Australians in the colonial territory of New Guinea.

Letters to Anne McCosker from Dr A.M. (Allan) Healy.

Letters to Anne McCosker from David Behrens.

Correspondence with D.O. (Mick) Smith.

Letters written to family by Frederick (Fred) William Scott Martin while Martin was serving with the Australian Imperial Force in Australia, Egypt, Gallipoli, the United Kingdom and finally the Western Front from 1915 to 1917. Martin was Anne McCosker's uncle. The letters were published by McCosker in Lieutenant Martin's Letters (2013).