Correspondence, a statement of claim and associated documents and a copy of a judgement in the Supreme Court of the Territory of Papua New Guinea in the case of Stanley McCosker and Henry Walford King (plaintiffs) and Gustav Thomas Kuster (defendant). The Court ruled in favour of the plaintiffs and an application by the defendant Kuster for leave to appeal to the High Court of Australia was refused.

Two ledgers detailing expenses, incomes and assets of the Matala Plantation from July 1954 to June 1955.

Correspondence between Stan McCosker and the University of Queensland relating to the application by Anne McCosker for enrolment as an external studies student in a Bachelor of Arts degree.

Handwritten draft of a talk delievered by Marjorie McCosker to the Business Professional Women's Club (Brisbane).

Documents collected and collated by Anne McCosker 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.

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.

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.

Two letters and typed manuscripts of 10 short articles about life in New Britain.

Letters, newspaper cuttings and an extract from The Rabaul Times. Most of the file comprises letters written in New Guinea by Marjorie McCosker to her friend in Australia, Madge White, addressed in the letters as Whitey.