History 1,470 History and criticism 437 Social aspects 346 Social conditions 342 Politics and government 286 Criticism and interpretation 157 Social life and customs 135 Economic conditions 125 Music 119 Philosophy 116 Civilization 114 Political aspects 113 Religious aspects 111 Women 109 Ethnic relations 90 Religion 90 Motion pictures 88 Race relations 80 African Americans 79 Emigration and immigration 77 Intellectual life 73 Government policy 66 Foreign relations 65 Jews 63 Economic aspects 61 Political activity 61 Psychological aspects 58 Christianity 55 Research 55 Ecology 52