History 233 African Americans 66 Education 54 Politics and government 51 Social conditions 43 Travel 39 Description and travel 38 Economic conditions 36 Enslavement 36 Slavery 36 Emigration and immigration 35 Women 24 Diplomatic relations 23 Foreign relations 23 Social life and customs 23 Manners and customs 22 Accounting 21 World War, 1939-1945 18 Mexican Americans 16 Controversial literature 14 Irish Americans 14 Population 14 Race relations 14 Economic aspects 13 History and criticism 13 Japanese Americans 13 Working class 13 Employment 12 Folklore 12 Tales 12