British Commonwealth. About 20 books/publications including Robson Lowe, Local Stamps of Australia by Bill Hornadge (Dubbo 1982), British Empire Campaigns and Occupations in the Near East 1914-1924. A Postal History by John Firebrace (London 1981), The Postal History of the Occupation of Malaya and British Borneo 1941-1945 by Edward Proud (Heathfield 1992) etc.