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Resources share the relationship sub focus to 20th century
- London (England) -- Social conditions -- 20th century -- Drama
- United States, Supreme Court -- Officials and employees -- Selection and appointment -- History -- 20th century
- Authors, American -- 20th century -- Family relationships
- Shanghai (China) -- History -- 20th century -- Fiction
- Immigrants -- United States -- History -- 20th century -- Juvenile fiction
- Florida Keys (Fla.) -- History -- 20th century -- Fiction
- Jewish refugees -- Africa, North -- History -- 20th century -- Comic books, strips, etc
- English poetry -- 20th century
- Black power -- United States -- History -- 20th century
- Bornholm (Denmark) -- History -- 20th century -- Juvenile fiction
- Internal security -- United States -- History -- 20th century
- Poets, American -- 20th century
- Authors, American -- 20th century -- Biography -- Comic books, strips, etc
- African Americans + Legal status, laws, etc + History -- 20th century
- Retail stores -- England -- London -- 20th century -- Drama
- Marriages of royalty and nobility -- Great Britain -- History -- 20th century
- Germany -- Intellectual life -- 20th century
- Austria -- History -- 20th century -- Fiction
- Palestine -- History -- 20th century
- Newburyport (Mass.) -- History -- 20th century
- Sex role -- United States -- History -- 20th century
- France -- Social life and customs -- 20th century -- Fiction
- Taiwan -- History -- 20th century -- Comic books, strips, etc
- United States -- Foreign relations -- 20th century
- African Americans + Civil rights + History -- 20th century -- Juvenile literature
- Ireland -- Civilization -- 20th century
- Texas -- History -- 20th century -- Fiction
- Fascism -- United States -- History -- 20th century
- Race discrimination -- United States -- History -- 20th century -- Comic books, strips, etc
- Arkansas -- Intellectual life -- 20th century
- Authors, Irish -- 20th century -- Fiction
- Dust storms -- Great Plains -- History -- 20th century
- United States, National Aeronautics and Space Administration -- History -- 20th century
- Appalachian Region -- History -- 20th century -- Fiction
- Connecticut -- History -- 20th century -- Juvenile drama
- Muskogee (Okla.) -- Social life and customs -- 20th century -- Juvenile literature
- United States -- Social conditions -- 20th century -- Fiction
- Cambridge (Mass.) -- Social life and customs -- 20th century -- Fiction
- Fires -- California -- San Francisco -- History -- 20th century -- Juvenile literature
- Civil rights movements -- Louisiana -- New Orleans -- History -- 20th century -- Juvenile literature
- Battles + History -- 20th century
- Gary (Ind.) -- History -- 20th century -- Fiction
- Minnesota -- History -- 20th century -- Fiction
- Social conflict -- England -- 20th century -- Drama
- Race discrimination -- United States -- History -- 20th century
- Pittsburgh (Pa.) -- History -- 20th century -- Fiction
- African Americans + Intellectual life -- 20th century
- Jews -- Poland -- History -- 20th century -- Comic books, strips, etc
- Segregation in transportation -- Alabama -- Montgomery -- History -- 20th century -- Juvenile literature
- Italy -- History -- 20th century -- Fiction