History 90 Islam 49 Politics and government 49 English fiction 38 Terrorism 29 Biography 25 Management 23 Religious aspects 23 Intelligence service 22 Foreign relations 18 Leadership 18 Military policy 15 Armed Forces 14 National security 14 International relations 13 Customs and practices 11 Doctrines 11 Army 10 Military art and science 10 Prevention 10 Psychology 10 Campaigns 9 Economic conditions 9 Fiction 9 Handbooks, manuals, etc 9 Success 9 Case studies 8 Economic policy 8 Research 8 Strategy 8