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Terrorism -- Religious aspects -- 35 Islam 33 Prevention -- 32 Prevention 25 Government policy -- 21 War on Terrorism, 2001- 17 more ... Terrorism 14 September 11 Terrorist Attacks, 2001 13 Terrorists -- 12 History -- 11 National security -- 11 Politics and government -- 9 Intelligence service -- 8 Jihad 8 Finance 7 Juvenile literature 7 Moral and ethical aspects 7 Psychology 7 Biography -- 6 Foreign relations -- 6 History 6 Islamic fundamentalism -- 6 Psychological aspects 6 Security, International 6 Economic aspects 5 Encyclopedias 5 IS (Organization) 5 Law and legislation -- 5 Qaida (Organization) 5 less ...