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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
- Oklahoma -- History -- 20th century -- Comic books, strips, etc -- Juvenile fiction
- Novelists, English -- 20th century -- Biography -- Juvenile literature
- Bahamas -- Social life and customs -- 20th century -- Fiction
- France -- Social life and customs -- 20th century -- Drama
- Chichi Island (Japan) -- History, Military -- 20th century
- Women -- France -- Paris -- History -- 20th century
- Riots -- Oklahoma -- Tulsa -- History -- 20th century
- Government, Resistance to -- Denmark -- History -- 20th century -- Juvenile literature
- Women -- New York (State) -- New York -- Social conditions -- 20th century
- South Carolina -- History -- 20th century -- Juvenile fiction
- Lawrence (Mass.) -- History -- 20th century -- Fiction
- Space flight to the moon + History -- 20th century -- Juvenile literature
- Art treasures in war -- Europe -- History -- 20th century
- Lisbon (Portugal) -- History -- 20th century
- School integration -- Arkansas -- Little Rock -- History -- 20th century -- Juvenile fiction
- Great Britain -- History -- 20th century -- Drama
- Prisoner-of-war escapes -- Germany -- Colditz -- History -- 20th century
- Industrial accidents -- Massachusetts -- Boston -- History -- 20th century
- Manhattan (New York, N.Y.) -- History -- 20th century -- Fiction
- New England -- History -- 20th century
- Philosophy, German + History -- 20th century
- Presidents' spouses -- United States -- History -- 20th century
- Tankers + Accidents -- Alaska -- Prince William Sound Region -- History -- 20th century
- Art, American -- 20th century -- Exhibitions
- Albanians -- Macedonia (Republic) -- History -- 20th century -- Drama
- Floods -- Massachusetts -- Boston -- History -- 20th century -- Juvenile literature
- United States + Social conditions -- 20th century
- Massachusetts -- Emigration and immigration -- 20th century
- Mexican Americans + Segregation -- California -- Lemon Grove -- History -- 20th century -- Juvenile literature
- Murder -- Alabama -- Birmingham -- History -- 20th century
- Rural-urban migration -- United States -- History -- 20th century
- Riots -- Oklahoma -- Tulsa -- History -- 20th century -- Juvenile literature
- Industrial hygiene -- United States -- History -- 20th century
- Exiles -- Portugal -- Lisbon -- History -- 20th century
- Nazis -- Poland -- History -- 20th century -- Juvenile fiction
- Russia -- History -- 20th century -- Fiction
- South America -- Politics and government -- 20th century -- Drama
- United States, Marine Corps -- Indian troops -- History -- 20th century -- Comic books, strips, etc. -- Juvenile literature
- United States -- History, Naval -- 20th century -- Drama
- Noncitizens -- Isle of Man -- History -- 20th century
- Police shootings -- Australia -- Uluru/Ayers Rock (N.T.) -- History -- 20th century
- Music -- Massachusetts -- Boston -- 20th century -- History and criticism
- African Americans + Crimes against -- Mississippi -- History -- 20th century
- Fashion -- Great Britain -- History -- 20th century
- Ireland -- 20th century -- Fiction
- Authors, Argentine -- 20th century -- Biography
- Trials -- California -- Los Angeles -- History -- 20th century
- Vietnam -- History -- 20th century -- Juvenile fiction