Foreign relations 56 History 53 Military policy 45 Air power 40 National security 39 Defenses 34 Armed Forces 31 World War, 1939-1945 31 Australia 24 Biography 19 Congresses 17 Thesis 17 Dissertations, Academic 16 Study and teaching 15 Campaigns 13 Military relations 13 Politics and government 13 Defences 11 Economic conditions 10 Sea-power 10 English language 9 Personal narratives, Australian 9 World war, 1939-1945 9 Economic policy 8 Military art and science 8 Prisoners of war 8 Problems, exercises, etc 8 Aeronautics, Military 7 Foreign speakers 7 Regimental histories 7