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Resources share the relationship sub focus to 20th century
- American literature -- 20th century -- History and criticism
- Appalachian Region -- History -- 20th century -- Fiction
- American poetry -- 20th century -- Periodicals
- Bank robberies -- United States -- History -- 20th century -- Juvenile literature
- Art metal-work + History -- 20th century
- Interior decoration -- United States -- History -- 20th century
- New York (State) -- History -- 20th century -- Fiction
- Segregation in transportation -- Alabama -- Montgomery -- History -- 20th century -- Juvenile literature
- Pennsylvania -- History -- 20th century -- Fiction
- Rhode Island -- History -- 20th century -- Juvenile fiction
- Long Island (N.Y.) -- History -- 20th century -- Fiction
- United States -- Social life and customs -- 20th century -- Fiction
- Chichi Island (Japan) -- History, Military -- 20th century
- Architecture -- California -- 20th century
- Humorists, American -- 20th century -- Travel
- Canadian Rockies (B.C. and Alta.) -- Intellectual life -- 20th century
- School integration -- Arkansas -- Little Rock -- History -- 20th century -- Juvenile fiction
- Jewelry + History -- 20th century
- Norway -- History -- 20th century -- Fiction
- Industrial hygiene -- United States -- History -- 20th century
- China -- History -- 20th century -- Fiction
- United States -- Armed Forces -- Transportation -- History -- 20th century
- Armored vehicles, Military -- Soviet Union -- History -- 20th century
- American poetry -- 20th century -- History and criticism
- London (England) -- History -- 20th century -- Juvenile fiction
- Drama -- 20th century -- Periodicals
- Nice (France) -- Social life and customs -- 20th century -- Fiction
- Biography -- 20th century
- Art, Modern -- 20th century
- Baltimore (Md.) -- History -- 20th century -- Fiction
- Women dramatists, American -- 20th century -- Biography
- English poetry -- 20th century -- History and criticism
- Spain -- Civilization -- 20th century
- Wealth + Moral and ethical aspects -- 20th century -- Fiction
- Wealth + Psychological aspects -- 20th century -- Fiction
- Soviet Union, Sovetskai͡a Armii͡a -- Armored troops -- History -- 20th century
- Jersey -- History -- 20th century -- Fiction
- Authors, English -- 20th century -- Biography -- Juvenile literature
- Americans -- Europe -- 20th century -- Fiction
- Novelists, American -- 20th century -- Biography -- Juvenile literature
- Venice (Italy) -- History -- 20th century -- Fiction
- Social change -- United States -- History -- 20th century -- Personal narratives
- English poetry -- 20th century
- History, Modern -- 20th century -- Periodicals
- Mississippi -- History -- 20th century -- Juvenile fiction
- Authors, American -- 20th century -- Family relationships
- Kentucky -- Social life and customs -- 20th century -- Fiction
- War horses -- United States -- History -- 20th century
- War horses -- Korea (South) -- History -- 20th century
- African Americans + Civil rights + History -- 20th century -- Juvenile literature