History 253 Politics and government 93 Social conditions 54 Management 49 Sociology 44 Social aspects 43 Philosophy 38 Psychological aspects 31 Family members 30 Methodology 30 Psychology 30 African Americans 29 Presidents 26 Social sciences 26 Women 26 Research 24 Education 23 Foreign relations 23 Industrial management 23 Civilization 22 Diplomatic relations 21 Economic conditions 21 Leadership 21 Political science 21 Moral and ethical aspects 20 Race relations 20 Religion 20 Marketing 18 World War, 1939-1945 18 Families 17