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20th Century - Smithsonian American Art Museum
11 Most Famous 20th Century Artists and Paintings - Artst
20th-century art - Wikipedia
A Brief Timeline of 20th Century Visual Art Movements
Modern Paintings - National Gallery of Art
20th-century Western painting - Wikipedia
American Paintings, 1900–1945 - National Gallery of Art
Hopper: The Supreme American Realist of the 20th-Century
Explore The Paintings of Expressionism Around The World
The 20th century - Encyclopedia Britannica