History Sources 13 Fiction 9 Bumppo, Natty (Fictitious character) 7 Frontier and pioneer life 6 Mohegan Indians 6 Armenians 5 Biography 5 Politics and government 5 Social conditions 5 American literature 4 Education 4 History and criticism 4 Influence 4 Philosophy 4 Research 4 Study and teaching 4 Causes 3 Economic conditions 3 Finance 3 Foreign relations 3 Intellectual life 3 Journalism 3 Labor unions 3 Minorities 3 Motion pictures 3 Relations 3 Science 3 Theater 3 Working class 3