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.
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.