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Resources share the relationship sub focus to 20th century
- Novelists, English -- 20th century -- Biography
- Przemyśl (Poland) -- History -- 20th century -- Fiction
- Key West (Fla.) -- History -- 20th century -- Comic books, strips, etc
- Liverpool (England) -- 20th century -- Juvenile fiction
- Civil rights movement -- History -- 20th century -- Juvenile literature
- London (England) -- History -- 20th century -- Juvenile drama
- United States -- Race relations -- History -- 20th century -- Juvenile literature
- First strike (Nuclear strategy) + History -- 20th century
- Authors, American -- 20th century -- Family relationships -- Juvenile literature
- War correspondents -- Europe -- History -- 20th century
- World politics -- 20th century
- Wellington (Wash.) -- History -- 20th century -- Juvenile fiction
- Hockey -- United States -- History -- 20th century
- School integration -- Tennessee -- Clinton -- History -- 20th century
- Jews -- Europe -- History -- 20th century -- Juvenile literature
- Civil rights movements -- Southern States -- History -- 20th century
- African Americans + Civil rights -- Alabama -- Selma -- History -- 20th century
- Greenwood (Tulsa, Okla.) -- Race relations -- History -- 20th century
- Women authors, American -- 20th century -- Biography -- Juvenile literature
- New Orleans (La.) -- History -- 20th century -- Juvenile fiction
- Jews -- Europe -- History -- 20th century -- Comic books, strips, etc
- Military history, Modern -- 20th century -- Pictorial works
- United States -- History, Military -- 20th century -- Fiction
- Brighton (England) -- History -- 20th century -- Fiction
- Heads of state + History -- 20th century
- Famines + Social aspects -- Korea (North) -- History -- 20th century
- Novelists, American -- 20th century -- Family relationships
- Texas -- Social conditions -- 20th century -- Fiction
- Children -- United States -- Social conditions -- 20th century
- Drugs -- Germany -- History -- 20th century
- Civil rights movements -- United States -- History -- 20th century -- Juvenile poetry
- Military weapons + History -- 20th century -- Juvenile literature
- New Jersey -- History -- 20th century -- Juvenile fiction
- Nuclear physics + Research -- United States -- History -- 20th century -- Juvenile literature
- Milwaukee (Wis.) -- History -- 20th century -- Juvenile fiction
- Bucharest (Romania) -- History -- 20th century -- Juvenile fiction
- Miami (Fla.) -- History -- 20th century -- Juvenile fiction
- Alaska -- History -- 20th century -- Juvenile fiction
- African Americans + Travel + History -- 20th century
- Espionage, American + History -- 20th century
- Migration, Internal -- United States -- History -- 20th century
- Harlem (New York, N.Y.) -- History -- 20th century -- Fiction
- Birmingham (Ala.) -- History -- 20th century -- Fiction
- California -- History -- 20th century -- Fiction
- Adoption agencies + Corrupt practices -- United States -- History -- 20th century
- Asiatic elephant -- Burma -- History -- 20th century
- Discrimination in housing + Government policy -- United States -- History -- 20th century
- Washington (State) -- History -- 20th century -- Fiction
- Romanov, House of -- History -- 20th century -- Sources
- American fiction -- 20th century -- Film and video adaptations