History 252 Biography 90 Presidents 56 Politics and government 53 Artists 41 History and criticism 41 Foreign relations 40 Rock musicians 40 Authors, American 38 Slaves 36 Journalists 33 Statesmen 27 Slavery 25 African Americans 24 Social conditions 24 Jazz musicians 21 Criticism and interpretation 19 Motion picture producers and directors 19 Feminists 18 Photographers 17 Singers 17 Blues musicians 16 Composers 16 Architects 15 Businessmen 15 Civil rights 15 Inventors 15 Race relations 15 Civil rights workers 14 Painters 14