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Resources share the relationship sub focus to 20th century
- Theater -- New York (State) -- New York -- History -- 20th century
- Broadway (New York, N.Y.) -- History -- 20th century
- Bowery (New York, N.Y. : Street) -- History -- 20th century
- Africa -- Social life and customs -- 20th century
- United States -- Social conditions -- 20th century
- London (England) -- History -- 20th century -- Drama
- High school students -- California -- 20th century -- Drama
- Antisemitism -- United States -- History -- 20th century -- Fiction
- Authors, Scottish -- 20th century -- Biography
- Crystal City (Tex.) -- History -- 20th century
- Oak Ridge (Tenn.) -- History -- 20th century
- Genetic code + Research + History -- 20th century
- Iran -- Social life and customs -- 20th century -- Comic books, strips, etc
- Military nursing -- United States -- History -- 20th century
- Air travel -- England -- History -- 20th century
- African Americans -- Michigan -- Detroit -- 20th century -- Drama
- Great Plains -- Social conditions -- 20th century -- Juvenile literature
- Conservatism -- United States -- History -- 20th century
- Poland -- History -- 20th century -- Fiction
- Great Plains -- History -- 20th century -- Juvenile literature
- Galveston (Tex.) -- History -- 20th century -- Juvenile literature
- Vienna (Austria) -- History -- 20th century -- Fiction
- Suburbs -- Massachusetts -- Boston -- History -- 20th century -- Fiction
- Women + Armed forces -- United States -- History -- 20th century
- Cork (Ireland) -- History -- 20th century -- Fiction
- Greenwood (Tulsa, Okla.) -- History -- 20th century
- Literature and society -- United States -- History -- 20th century
- Los Angeles (Calif.), Police Dept. -- History -- 20th century
- Authors, English -- 20th century
- North Auburn Region (Me.) -- Social life and customs -- 20th century
- African Americans + History -- 20th century
- Exhibitions -- United States -- 20th century
- Germany -- Civilization -- 20th century -- Juvenile literature
- Peace treaties -- 20th century
- Circus performers -- Germany -- 20th century -- Drama
- Afghanistan -- Social conditions -- 20th century -- Juvenile fiction
- Travelers -- Arizona -- Grand Canyon -- History -- 20th century
- United States, Dept. of the Treasury -- Officials and employees -- 20th century
- Politics and culture -- United States -- History -- 20th century -- Drama
- Murder -- England -- London -- History -- 20th century
- Washington (D.C.) -- History -- 20th century -- Juvenile fiction
- Rock music festivals -- New York (State) -- History -- 20th century
- Silver flatware -- United States -- History -- 20th century
- Bridges -- United States -- History -- 20th century
- Art objects, American -- 20th century -- Handbooks, manuals, etc
- Human rights movements + History -- 20th century
- San Francisco (Calif.) -- History -- 20th century -- Fiction
- Authors, American -- 20th century -- Biography
- Terrorism + Prevention -- United States -- History -- 20th century
- Munich (Germany) -- History -- 20th century -- Fiction