History 64 African Americans 18 Race relations 16 Histoire 15 Description and travel 14 Social life and customs 13 Civil rights 12 更多 ... Civil rights workers 9 Segregation in transportation 9 Frontier and pioneer life 8 Buildings, structures, etc 7 African American women 6 Indians of North America 6 Social conditions 6 Statue of Liberty (New York, N.Y.) 5 Travel 5 Cowboys 4 Descriptions et voyages 4 Pioneers 4 School integration 4 African American children 3 African American civil rights workers 3 Discovery and exploration 3 Droits 3 Effect of human beings on 3 Folklore 3 Nature 3 Ranch life 3 Segregation 3 Water quality 3 少 ...