19^th Century Art Resources
http://witcombe.sbc.edu/ARTHLinks5.html
This site provides examples of Symbolism and Impressionism with links to images of important nineteenth-century artists.

Impressionism.org
http://www.impressionism.org/
This site presents a virtual tour of the history of Impressionism, with narration and examples from portraits of key artists.

Symbolism
http://www.usc.edu/schools/annenberg/asc/projects/comm544/library/styles/SymbolismSymbolistMovement.html
Online examples of Symbolist art is provided at this site, albeit with little narrative introduction or artist biography.