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Resources share the relationship sub focus to 20th century
- London (England) -- 20th century -- Fiction
- Women -- Texas -- Houston -- Social life and customs -- 20th century
- Authors, American -- 20th century -- Biography -- Childhood and youth
- Art pottery, American -- Ohio -- Zanesville -- 20th century -- Catalogs
- United States -- Social life and customs -- 20th century -- Fiction
- Women novelists, English -- 20th century -- Fiction
- Novelists, English -- 20th century -- Biography -- Juvenile literature
- Chichi Island (Japan) -- History, Military -- 20th century
- Space flight to the moon + History -- 20th century -- Juvenile literature
- Art treasures in war -- Europe -- History -- 20th century
- School integration -- Arkansas -- Little Rock -- History -- 20th century -- Juvenile fiction
- Education -- Colorado -- History -- 20th century
- Great Britain -- History -- 20th century -- Drama
- London (England) -- Social conditions -- 20th century
- Industrial accidents -- Massachusetts -- Boston -- History -- 20th century
- Social change + History -- 20th century
- United States, Central Intelligence Agency -- History -- 20th century
- Pacifism -- Great Britain -- History -- 20th century
- Atlantic Coast (U.S.) -- History, Naval -- 20th century
- Fascism -- United States -- History -- 20th century
- Counterculture -- United States -- History -- 20th century
- Football -- United States -- History -- 20th century
- Homophobia -- Louisiana -- New Orleans -- History -- 20th century
- Periodicals + Publishing -- New York (State) -- New York -- History -- 20th century
- Cooking, American + History -- 20th century
- United States, Army, Airborne Division, 101st -- History -- 20th century
- Dramatists, American -- 20th century -- Fiction
- Great Britain -- Politics and government -- 20th century -- Drama
- Saint Petersburg (Russia) -- History -- 20th century
- Dust storms -- Great Plains -- History -- 20th century
- United States, National Aeronautics and Space Administration -- History -- 20th century
- Appalachian Region -- History -- 20th century -- Fiction
- United States -- Social conditions -- 20th century -- Fiction
- Cambridge (Mass.) -- Social life and customs -- 20th century -- Fiction
- American literature -- 20th century -- History and criticism
- Atlantic Coast (Spain) -- History, Military -- 20th century
- Maine -- History -- 20th century -- Juvenile fiction
- Gay liberation movement -- Louisiana -- New Orleans -- History -- 20th century
- Country life -- Canada -- 20th century -- Drama
- Aircraft accidents -- New Jersey -- History -- 20th century
- Interior decoration -- United States -- History -- 20th century
- China -- Politics and government -- 20th century
- Minnesota -- History -- 20th century -- Fiction
- New York (State) -- History -- 20th century -- Fiction
- Social conflict -- England -- 20th century -- Drama
- Race discrimination -- United States -- History -- 20th century
- Pittsburgh (Pa.) -- History -- 20th century -- Fiction
- Women and literature -- England -- History -- 20th century
- Petroleum refineries + Location -- New Hampshire -- Durham -- Public opinion -- History -- 20th century
- Steamboat disasters -- Atlantic Ocean -- History -- 20th century -- Juvenile literature