History 178 Indians of North America 46 Antiquities 39 Social conditions 29 African Americans 26 Certification 26 Examinations 26 more ... Race relations 24 Politics and government 23 Teachers 22 Excavations (Archaeology) 21 History and criticism 18 Teaching 18 Social life and customs 16 Civil rights 15 Description and travel 14 Social aspects 14 Environmental conditions 13 Ethnic relations 13 Seminole Indians 12 American literature 11 Cuban Americans 11 Travel 11 Cubans 10 Discovery and exploration 10 Research 10 Restoration ecology 10 Economic conditions 9 Emigration and immigration 9 Immigrants 9 less ...