Personal and official papers relating to Gellibrand's military career in South Africa (1899-1902) and Ceylon (1905-1912) but particularly in the 1914-1918 world war. There are diaries (1908-1942), notebooks, correspondence, paybooks, newspaper cuttings, certificates, postcards, photographs, German captured letters, cards and notebooks, subject files, maps, printed material including some items in German and military orders. The correspondence has copies of letters by Gellibrand and in-letters from Lord Birdwood, Lt. Gen. Talbot Hobbs, John Masefield, Maj. Gen. Brudenall White, Sr. Neville Howse, Dr. C. E. W. Bean, Lt. Col. D. S. Allsop, Brig. Gen. W. R. McNicoll and Maj. H. C. Brinsmead. A small amount of family correspondence can be found here too, such as copies of letters from Gellibrand to his brother Tom (1915-1919) and from Dr Bean to Lady Gellibrand and Cynthia Gellibrand (1949-1950). The subject files cover topics like canteens, repatriation and demobilisation, machine guns, map reading, pay, honours and rewards, elections-Australia 1917, gas warfare, discipline and the 1-3 Australian Divisions.