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Resources share the relationship sub focus to 21st century
- Military art and science + Technological innovations -- United States -- History -- 21st century
- Horror tales, American -- 21st century
- College sports -- United States -- History -- 21st century
- United States -- History, Military -- 21st century
- FICTION + World Literature -- England -- 21st century
- Literature and folklore -- Eswatini -- 21st century
- Boys -- United States -- Social conditions -- 21st century
- Hijacking of ships -- Somalia -- 21st century
- American prose literature -- 21st century -- Periodicals
- Authors, American -- 21st century -- Books and reading
- United States -- Race relations -- 21st century
- Authors, Guyanese -- 21st century -- Biography
- Spies -- 21st century -- Fiction
- Wall Street (New York, N.Y.) -- History -- 21st century
- Counterinsurgency -- Iraq -- Baghdad -- History -- 21st century
- Architecture, Modern -- 21st century
- American essays -- 21st century
- Women's rights -- United States -- History -- 21st century -- Juvenile literature
- Civil rights -- United States -- History -- 21st century
- Forensic archaeology -- Oklahoma -- Tulsa -- History -- 21st century
- Adult children -- United States -- History -- 21st century
- Civilization, Modern -- 21st century
- International relations + History -- 21st century
- Journalism + Political aspects -- United States -- History -- 21st century
- World politics -- 21st century -- Forecasting
- Military art and science + History -- 21st century
- Finance -- United States -- History -- 21st century
- Material culture -- California -- Los Angeles -- History -- 21st century
- United States, Supreme Court -- History -- 21st century
- White supremacy movements -- Kansas -- History -- 21st century
- Demonstrations -- United States -- History -- 21st century -- Juvenile literature
- Girls + Social conditions -- 21st century
- United States -- History -- 21st century
- Korea (North) -- 21st century -- Juvenile literature
- Afghanistan -- History -- 21st century -- Juvenile fiction
- Australian fiction -- 21st century
- Women authors, American -- 21st century -- Biography
- American poetry -- 21st century -- Poetry
- Political campaigns -- United States -- History -- 21st century
- Pirates -- Somalia -- 21st century
- Maine -- Social life and customs -- 21st century
- Arab countries -- Politics and government -- 21st century
- Middle East -- History -- 21st century
- Iran -- Foreign relations -- 21st century
- Violent crimes -- United States -- 21st century
- Mazār-i Sharīf (Afghanistan) -- History, Military -- 21st century
- United States -- Social conditions -- 21st century
- United States -- Foreign relations -- 21st century
- Protest movements -- Arab countries -- History -- 21st century
- Piracy -- Somalia -- 21st century