History 154 English language 78 Politics and government 61 International relations 54 Foreign relations 44 World politics 38 Study and teaching 30 Textbooks for foreign speakers 20 Islam 18 Military art and science 18 World War, 1939-1945 18 Problems, exercises, etc 17 Economic conditions 16 Economic aspects 15 Philosophy 15 World War, 1914-1918 15 Armed Forces 14 Congresses 14 Dictionaries 14 Political aspects 14 History, Military 13 Military policy 13 Nationalism 13 Case studies 12 Economic policy 12 Government policy 12 Leadership 12 Military history, Modern 12 Security, International 12 Terrorism 12