Travel Description and travel 198 History 33 Social life and customs 23 Manners and customs 18 Authors, American 12 Jews 10 更多 ... Politics and government 10 Social conditions 10 Authors, French 8 Authors, German 8 Discovery and exploration 8 Discoveries in geography 7 Explorers 7 Biography 5 History and criticism 5 Holocaust, Jewish (1939-1945) 5 African Americans 4 Americans 4 Arab-Israeli conflict 4 Ethnic relations 4 Families 4 Family 4 Frontier and pioneer life 4 Natural history 4 Pioneers 4 Political and social views 4 Air pilots, Military 3 American 3 Artists 3 少 ...