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- Presidents 26
- Politics and government 20
- History 10
- Foreign relations 6
- Influence 6
- Operas 6
- Criticism and interpretation 4
- Family 4
- Political and social views 4
- American prose literature 2
- Biography 2
- Civil service reform 2
- Civilization 2
- Cruise, 1907-1909 2
- Election 2
- Family relationships 2
- History and criticism 2
- History, Naval 2
- Immigrants 2
- Imperialism 2
- Intellectual life 2
- Knowledge 2
- Knowledge and learning 2
- Moral and ethical aspects 2
- Motion pictures 2
- National security 2
- Natural history 2
- Natural history literature 2
- Nature in literature 2
- Nature in motion pictures 2
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