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.

Handwritten and typed drafts of Anne McCosker's poems and short stories, often with heavy editing and annotations, and notes and drafts for the book Lieutenant Martin's Letters. Many of the drafts of poems and stories are in notebooks. The series also contains a typed draft of a story titled 'Pacific Pot Pourri: Concerning One Klearwatgear', written during World War 2 by Winifred Martin.

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

Notebooks containing handwritten drafts of poems published in Sea Watch.

Research notes for, and annotated drafts of, Lieutenant Martin's Letters : an Anzac in the Great War.

Typed drafts of two articles about the writing of Masked Eden, articles titled 'What About Rabaul?' and 'Rombin', and a poem, 'Namanula Hill'.

Personal correspondence both incoming and outgoing, mostly relating to Anne McCosker's research on the history of Australians in the colonial territory of New Guinea and her book Masked Eden.

Letters to Anne McCosker from John Leeuwin-Clark and Pat Leeuwin-Clark.

Correspondence with Margaret Reeson and correspondence between Richard Buckley and Teresa Pitt about Margaret Reeson's book A Very Long War.

Correspondence with D.O. (Mick) Smith.