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Resources share the relationship sub focus to 20th century
- Morocco -- History -- 20th century -- Drama
- United States, Central Intelligence Agency -- History -- 20th century
- Romanov, House of -- History -- 20th century -- Fiction
- United States, Secret Service -- History -- 20th century
- Pacifism -- Great Britain -- History -- 20th century
- 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
- Pennsylvania -- History -- 20th century -- Fiction
- Long Island (N.Y.) -- History -- 20th century -- Fiction
- Jews -- Ukraine -- History -- 20th century -- Juvenile fiction
- School integration -- Arkansas -- Little Rock -- History -- 20th century
- Adoption agencies + Corrupt practices -- United States -- History -- 20th century
- Jews -- Lithuania -- Eišiškės -- History -- 20th century -- Juvenile literature
- Washington (State) -- History -- 20th century -- Fiction
- Sabotage -- Norway -- History -- 20th century
- Europe, Eastern -- Social conditions -- 20th century
- Women novelists, American -- 20th century -- Family relationships
- United States -- History -- 20th century -- Juvenile fiction
- African Americans -- New York (State) -- New York -- Intellectual life -- 20th century
- Genocide -- Europe, Eastern -- History -- 20th century
- Botany -- Arizona -- Grand Canyon -- History -- 20th century
- Transatlantic voyages + History -- 20th century
- Poetry, Modern -- 20th century
- Authors, Japanese -- 20th century -- Biography
- Authors, American -- 20th century -- Biography -- Comic books, strips, etc -- Fiction
- Painters -- United States -- 20th century
- Greensboro (N.C.) -- History -- 20th century -- Juvenile literature