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National Gallery of Art
National Gallery of Art: Childe Hassam, "Allies Day"
This resource includes a picture of the famous painting, "Allies Day," as well as a brief description of the history behind it.
Other
Tfao: American Impressionism to Modernism
This site gives a breif history of art movements from Impressionism to Modernism, concentrating in America. There are also pages linked to key artists within each movement where you can also see their work.
Metropolitan Museum of Art
Metropolitan Museum of Art: Georges Seurat (1859 1891) and Neo Impressionism
The Metropolitan Museum of Art provides this informative page on Georges Seurat (1859-1891) and Neo-Impressionism. With information and pictures this in a nice resource for study.
Other
Lyme Art: American Impressionism
This site gives a brief history of the American Impressionists who painted in Lyme, Connecticut.
Other
An American Tradition: The Pennsylvania Impressionists
This site gives an in-depth look into the Pennsylvania Impressionists and their history.
Pennsylvania Historical and Museum Comission
Explore Pa History: Mary Cassatt
A concise biographical sketch that examines the life and contributions of nineteenth century impressionist and Pennsylvania native, Mary Cassatt.