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Resources share the relationship sub focus to 20th century
- Gangs -- England -- Birmingham -- History -- 20th century
- Espionage, American + History -- 20th century
- Astronautics + History -- 20th century -- Juvenile literature
- New Mexico -- History -- 20th century -- Juvenile fiction
- Great Britain -- History, Military -- 20th century
- Naval convoys -- Japan -- History -- 20th century
- Birmingham (England) -- Social conditions -- 20th century -- Fiction
- Normandy (France) -- History, Military -- 20th century -- Drama
- Women artists -- Mexico -- 20th century -- Exhibitions
- Tennis -- Australia -- History -- 20th century
- France -- Social conditions -- 20th century -- Drama
- Western Australia + History -- 20th century -- Chronology
- Art, American -- 20th century -- Exhibitions
- Police -- England -- London -- History -- 20th century
- Inventions + History -- 20th century -- Study and teaching (Secondary)
- Irish American families -- New York (State) -- New York -- 20th century -- Fiction
- Belfast (Northern Ireland) -- Social conditions -- 20th century -- Fiction
- French fiction -- 20th century
- Birmingham (England) -- Social conditions -- 20th century -- Drama
- Comedy sketches -- United States -- History -- 20th century
- Women -- New York -- Social conditions -- 20th century
- Intellectuals -- 20th century -- Biography
- Public libraries -- California -- Los Angeles -- History -- 20th century
- London (England) -- History -- 20th century -- Juvenile fiction
- Workers + Social conditions -- 20th century -- Fiction
- Popular music -- 20th century -- Miscellanea
- Monarchy -- Great Britain -- History -- 20th century -- Fiction
- Brooklyn (New York, N.Y.) -- 20th century -- Fiction
- Queensland -- History -- 20th century -- Fiction
- New Zealand -- Social life and customs -- 20th century
- Women in agriculture -- Australia -- History -- 20th century
- Jews -- Europe -- History -- 20th century -- Comic books, strips, etc
- Poets, Australian -- 20th century
- Brighton (England) -- History -- 20th century -- Fiction
- Cheshire (England) -- Social conditions -- 20th century
- Western Australia + Perth -- Manufactures -- History -- 20th century
- Suffolk (England) -- History -- 20th century -- Fiction
- Diplomats -- United States -- History -- 20th century
- South Africa -- Politics and government -- 20th century -- Juvenile literature
- New South Wales -- Social life and customs -- 20th century -- Fiction
- New South Wales -- Social conditions -- 20th century
- California -- History -- 20th century -- Fiction
- Mexico City (Mexico) -- History -- 20th century -- Fiction
- Mackay (Qld.) -- History -- 20th century -- Fiction
- Australia -- Armed Forces -- History, Military -- 20th century
- Queensland -- History -- 20th century
- England, Northern -- History -- 20th century -- Fiction
- Organized crime -- Australia -- Sydney (N.S.W.) -- 20th century -- Drama
- Victoria -- History -- 20th century
- Kempsey (N.S.W.) -- Social conditions -- 20th century -- Fiction