Foreign relations 58 History 53 Military policy 49 Air power 45 National security 41 Defenses 35 Armed Forces 31 World War, 1939-1945 31 Australia 29 Congresses 21 Biography 19 Thesis 17 Dissertations, Academic 16 Military relations 15 Study and teaching 15 Campaigns 13 Politics and government 13 Sea-power 12 Defences 11 Economic conditions 10 English language 9 Personal narratives, Australian 9 World war, 1939-1945 9 Aeronautics, Military 8 Economic policy 8 Military art and science 8 Prisoners of war 8 Problems, exercises, etc 8 Strategic aspects 8 Foreign speakers 7