History 255 609 Politics and government 66 345 History and criticism 57 947 Social aspects 34 015 Social conditions 30 810 Philosophy 28 279 Criticism and interpretation 25 535 mer ... Jazz 23 849 Foreign relations 19 747 Economic conditions 19 609 Women 19 396 Social life and customs 18 896 Piano music 18 450 Education 17 971 Study and teaching 17 262 Religious aspects 16 643 Law and legislation 16 038 Research 15 747 Operas 15 434 Political aspects 15 350 African Americans 13 960 Symphonies 13 703 Music 13 369 Christianity 13 174 Motion pictures 12 970 Civilization 12 794 Management 12 068 Description and travel 12 056 Religion 12 029 Economic aspects 11 804 mindre ...