History 305 African Americans 115 Authors, American 39 Social life and customs 35 Baseball players 34 Childhood and youth 32 Presidents 32 Women 26 Civil rights 25 Race relations 23 History and criticism 21 Politics and government 21 Civil rights workers 20 Kings and rulers 20 Artists 18 Frontier and pioneer life 18 Pioneers 17 Poets, American 16 Social conditions 16 World War, 1939-1945 16 Civilization 15 Inventors 15 Painters 15 Slaves 15 Authorship 14 Holocaust, Jewish (1939-1945) 14 Physicists 14 Clergy 13 Criticism and interpretation 13 Jews 13