History 186 Biography 74 Presidents 53 Politics and government 45 Artists 39 Rock musicians 38 Slaves 35 History and criticism 33 Journalists 33 Authors, American 32 Foreign relations 31 Statesmen 27 Slavery 25 Jazz musicians 21 African Americans 18 Feminists 18 Motion picture producers and directors 18 Photographers 17 Singers 17 Social conditions 17 Blues musicians 16 Composers 16 Criticism and interpretation 16 Businessmen 15 Inventors 15 Architects 14 Civil rights workers 14 Painters 14 Dancers 13 Economists 13