The Wonderful Wizard of Oz
http://lcweb2.loc.gov/cgi-bin/ampage?collId=rbc3&fileName=rbc0001_2006gen32405page.db&recNum=0
A look inside the Library of Congress's first edition of the novel
The Wonderful Wizard of Oz
An exhaustive award-winning site maintained by an amateur Oz expert with Oz events, news, criticism, related links, etc.
The Wonderful Wizard of Oz
http://www.gutenberg.org/files/55/55-h/55-h.htm
The Project Gutenberg e-text of the novel
The Wizard of Oz: An American Fairytale
http://www.loc.gov/exhibits/oz/
The Library of Congress's online exhibition, complete with fascinating images, primary documents, and information
