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.

Letters from Noel Barry to Marjorie and Robin McCosker.

Letters from Stan McCosker to the Kokopo Sports Club relating to the auditing of the club's accounts.

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.

Photographic prints of people, plantation life and scenery in the Australian Territory of New Guinea. Locations include Matala Plantation, Kolopo and Rugenhafen. Some of the photographs feature members of the McCosker family and their associates. The album also contains a sequence of photographic negatives attributed to Walford King which show Chinese and Japanese fishing boats and cargo ships.

Letters from a folder labelled 'letters to Whitey', addressed to either Whitey or Auntie Spesh.

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.

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

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.

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.