Three maps of New Britain. The earliest map, dated 1927, shows New Britain in relation to surrounding islands and the New Guinea mainland. It includes an index of properties and places, and shows plantations and trading stations. The other two maps were issued by the U.S. Army in 1943 and show sections of New Britain. An accompanying note by Anne McCosker states the maps were used by Stan McCosker during the war years.

Final order dated 22 June 1953, re-establishing ownership of the Matala plantation to Herbert Walford King and Stanley McCosker under the New Guinea Land Titles Restoration Ordinance 1951-1952; and a map of the islands of the Hermit Group, supplied to H. Walford King in September 1956.

Three photographs taken at a 1949 ceremony in Rabaul for awarding of war medals. Stan McCosker is identified in one of the photographs.

A licence to drive a motor vehicle, issued by the Territory of Papua New Guinea to Stanley McCosker; a certificate issued by the Federal Institute of Accountants to Marjorie Martin certifying her as a Provisional Associate of the Institute; a sheet bearing the imprints of two ink stamps: the stamp of the Deutsche Kolonialgesellschaft Abteiling Bismarck Archipel, and the stamp of the New Guinea Compagnie. The original ink stamps used can be found in Series E, File 1.

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

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.

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.

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

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

Handwritten letters to family from Frederick (Fred) William Scott Martin during his war service in World War One. The correspondence in this file begins while Martin was in the trenches at the Western Front. His final letter is dated 31 August 1917. Martin was killed in action in Belgium on 20 September 1917. The final documents in this folder are an article about Martin published in The Humpybong Halcyon newspaper on 20 October 1917, a letter from the Queensland Department of Public Instruction to Martin's father, dated 6 December 1917, and a copy of a Commonwealth record detailing the actions that led to Martin being awarded the Military Medal.