History 424 Politics and government 145 Travel 89 Description and travel 87 History and criticism 63 Education 53 Foreign relations 52 Social life and customs 51 Diplomatic relations 50 Social conditions 42 Manners and customs 41 World War, 1939-1945 38 English language 36 Authors, American 34 Civilization 34 Philosophy 33 Family members 32 Presidents 32 African Americans 29 Women 29 Indigenous peoples 27 World War, 1914-1918 27 American poetry 26 Indians of North America 24 English poetry 23 American literature 22 Constitutional history 22 Economic conditions 22 Law 22 Middle Earth (Imaginary place) 20