History 254 788 Politics and government 66 061 History and criticism 57 620 Social aspects 33 965 Social conditions 30 707 Philosophy 28 235 Criticism and interpretation 25 107 mer ... Jazz 24 546 Foreign relations 19 680 Women 19 555 Economic conditions 19 534 Social life and customs 18 859 Piano music 18 223 Education 18 012 Study and teaching 17 340 Religious aspects 16 594 Law and legislation 16 059 Research 15 807 Operas 15 697 Political aspects 15 271 African Americans 14 021 Symphonies 13 735 Music 13 328 Christianity 13 158 Motion pictures 13 026 Civilization 12 717 Management 12 303 Description and travel 12 086 Religion 11 986 Economic aspects 11 785 mindre ...