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.

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).

Papers collected and organised for the purpose of writing the book Masked Eden. Papers include correspondence, newspaper cuttings, local news bulletins, typed manuscripts of stories, statements, copies of military records and some administrative records and photographs. Some correspondents in this subseries are also represented in Series B.

Correspondence of Anne McCosker's parents and their New Guinea associates, collected and used as source material for her book Masked Eden.

Documents relating to a claim by Stan McCosker and Walford King to the War Damage Commission for compensation for damage to the Matala Plantation in New Britain during the Japanese military occupation of New Guinea.

Papers of Anne McCosker's father, Stan McCosker, including correspondence, business records, court documents, maps, photographs and drafts of articles.

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.

Objects collected in the course of research for the books Masked Eden and Lieutenant Martin's Letters.

Photographic prints, postcards and some photographic negatives relating to the history of European-Australians involved with the plantation economy of Australian New Guinea. The series include images of Anne McCosker's family and their expatriate associates, local people participating in ceremonial performances, engaged in plantation labour or posing in portrait or group shots, and views of various locations in New Britain, New Ireland and other northern islands of New Guinea where the McCosker family was based. The majority of the photographs were taken in the 1920s, 1930s and the postwar 1940s, and many are captioned. Some were published in Anne McCosker's book, Masked Eden.

There are approximately 1243 b&w photographs, 53 b&w photo postcards and 12 negatives in this series.

Documents collected and collated by Anne McCosker and used as source material for her book Masked Eden.