Newspaper cuttings of articles about the German plantation owner and trader Heinrich Rudolph Wahlen and the house he built on Maron Island in the Hermit Group of islands of New Guinea. The file includes a photographic print of the house.

Assorted newspaper cuttings and articles about Heinrich Wahlen and other topics relating to colonial life in New Guinea. The file also contains letters from Stan McCosker to The Bulletin.

Assorted notes, newspaper cuttings and other documents relating to the publication and launch of Masked Eden.

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.

Documents relating to the eruption of volcanoes on Vulcan Island and Matupi, near Rabaul, in 1937. Documents include the 4 June 1937 issue of The Rabaul Times, three letters from around that time, a typed account of the events, and two published articles.

Papers relating to the evacuation of Marjorie McCosker from New Guinea to Brisbane in 1941. Documents include a permit dated 27 May 1941 issued to Marjorie, allowing her to leave and return to the Territory of New Guinea with two children; inventories of goods and personal effects shipped; and an offer of employment to Marjorie from St Margaret's School, Brisbane.

Letters from Stan to Marjorie McCosker in 1941 after she was evacuated from New Guinea to Australia, a letter from Stan McCosker to Walford King, and a letter from Marjorie to Francie King. The file also contains instructions dated 30 May 1940 from the Commanding Officer of the New Guinea Volunteer Rifles listing the personnel to escort enemy internees from Rabaul to Sydney. Stan McCosker is named as one of the seven members of the escort.

Documents relating to the Japanese military invasion of New Britain. Includes a letter from Stan to Marjorie McCosker dated 17 December 1941; correspondence between Marjorie and Francie King; a statement by A.J. Gaskin, S. McCosker and T.H. Targett concerning the military and civilian administration of Rabaul up to 22 January 1942; a copy of a statement by Mr McGowan about the Japanese invasion; a handwritten draft of a short story titled 'Escape' by Robin McCosker; and two newspaper cuttings.

Statements, personal accounts, copies of military records, memoirs and newpaper cuttings relating to the Japanese invasion and occupation of Rabaul.

Letters by Stan McCosker while on military service in New Guinea and North Queensland.