Periodicals 84 History 50 Work groups 37 Biography 35 Leadership 34 Terrorism 27 Juvenile literature 24 Politics and government 23 Teams in the workplace 21 Children's stories, English 20 Management 20 World War, 1939-1945 20 Foreign relations 18 Group relations training 18 Horror tales, English 18 Small groups 18 Translation into Malay 18 Armed Forces 17 Military art and science 17 Weapons systems 17 Campaigns 15 Congresses 15 Islam 15 National security 13 Training of 13 Employees 12 Group facilitation 12 Military supplies 12 Social groups 12 Weapon systems 12