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Resources share the relationship sub focus to 20th century
- Biography -- 20th century -- Periodicals
- Hamburg (Germany) -- History -- 20th century -- Fiction
- Iran -- Social life and customs -- 20th century -- Comic books, strips, etc
- Gangsters -- Illinois -- Chicago -- History -- 20th century -- Juvenile literature
- Authors, Colombian -- 20th century -- Biography
- Great Plains -- Social conditions -- 20th century -- Juvenile literature
- Great Plains -- History -- 20th century -- Juvenile literature
- Vienna (Austria) -- History -- 20th century -- Fiction
- Greenwood (Tulsa, Okla.) -- History -- 20th century
- Rwanda -- Ethnic relations -- History -- 20th century -- Juvenile literature
- Literature and society -- United States -- History -- 20th century
- London (England) -- History -- 20th century -- Drama
- Oak Ridge (Tenn.) -- History -- 20th century
- Poland -- History -- 20th century -- Fiction
- Hollywood (Los Angeles, Calif) -- History -- 20th century -- Fiction
- Photographs + History -- 20th century
- Authors, English -- 20th century
- African Americans + History -- 20th century
- Mexico -- History -- 20th century -- Juvenile fiction
- Valparaíso (Chile) -- History -- 20th century -- Fiction
- Lesbians -- United States -- History -- 20th century -- Juvenile literature
- Fashion design -- France -- History -- 20th century -- Juvenile literature
- Memphis (Tenn.) -- History -- 20th century -- Juvenile fiction
- Broadway (New York, N.Y.) -- History -- 20th century
- Munich (Germany) -- History -- 20th century -- Fiction
- Civil rights movements -- United States -- History -- 20th century
- United States -- History -- 20th century
- Dust storms -- Great Plains -- History -- 20th century -- Juvenile literature
- United States, Congress, House, Committee on Un-American Activities -- History -- 20th century
- Washington (D.C.) -- History -- 20th century -- Juvenile fiction
- Rock music festivals -- New York (State) -- History -- 20th century
- Bronx (New York, N.Y.) -- History -- 20th century -- Fiction
- 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
- Civilization, Modern -- 20th century -- Fiction
- Washington (State) -- History -- 20th century -- Fiction
- Sabotage -- Norway -- History -- 20th century
- Romanov, House of -- History -- 20th century -- Sources
- Women novelists, American -- 20th century -- Family relationships
- United States -- History -- 20th century -- Juvenile fiction
- Poetry, Modern -- 20th century
- Farmers -- Great Plains -- History -- 20th century
- Sicily (Italy) -- History, Military -- 20th century
- Farmers -- Great Plains -- Social conditions -- 20th century
- Portraits, American -- 20th century -- Catalogs
- San Francisco (Calif.) -- 20th century -- Fiction
- Human rights + History -- 20th century -- Chronology
- Scotland -- History -- 20th century -- Juvenile fiction