History 955 Politics and government 842 Foreign relations 560 Economic conditions 256 World politics 204 Biography 183 World War, 1939-1945 182 International relations 180 Armed Forces 172 Terrorism 148 Military policy 144 Social conditions 136 Leadership 128 Congresses 124 Economic policy 124 Communism 113 National security 105 Campaigns 101 Vietnam War, 1961-1975 95 Management 93 Military art and science 92 War 76 Case studies 66 Research 66 Political activity 63 Islam 59 Defenses 57 Relations 57 Security, International 57 Strategy 56