Matters of Fact

http://www.monticello.org/Matters/Fact_toc.html
"Information about Jefferson's many interests, from Chess to Children"

From Quackery to Bacteriology: The Emergence of Modern Medicine in 19th Century America

http://www.cl.utoledo.edu/canaday/quackery/quack-index.html
Images of documents with explanatory narrative.

The Avalon Project: 19th Century Documents

http://www.yale.edu/lawweb/avalon/19th.htm
Documents from the War of 1812 and the sectional crisis.

Thomas Jefferson Online

http://www.pbs.org/jefferson
Jefferson's major writings, transcripts of interviews with historians, and a free Declaration of Independence screensaver.