History 254 855 Politics and government 66 084 History and criticism 57 624 Social aspects 33 974 Social conditions 30 713 Philosophy 28 235 Criticism and interpretation 25 109 mer ... Jazz 24 548 Foreign relations 19 688 Women 19 558 Economic conditions 19 552 Social life and customs 18 861 Piano music 18 223 Education 18 112 Study and teaching 17 341 Religious aspects 16 597 Law and legislation 16 070 Research 15 815 Operas 15 698 Political aspects 15 278 African Americans 14 019 Symphonies 13 735 Music 13 341 Motion pictures 13 203 Christianity 13 158 Civilization 12 718 Management 12 305 Description and travel 12 090 Religion 11 987 Economic aspects 11 793 mindre ...