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.
Other
Mary Cassatt the Complete Works
View over 300 of Cassatt's paintings. You can conduct searches, watch slideshows, or view page by page. Also includes an extensive biography and many features that make finding and bookmarking your favorite works very easy.
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.