This is the homepage for The 1904 World's Fair Society, an organization of 1904 Fair enthusiasts. If you have questions about the fair or its memorabilia, these are the people to contact.
Lee Gaskins has created a wonderful website - Meet Me in St. Louis: The 1904 World's Fair Web Site.
Scenes from the 1904 World's Fair
"The Greatest of Expositions Completely Illustrated" Stop by Kathryn C. Kuenzel's site to see her wonderful collection of lithographs, detailed information and extensive list of world's fair links.
The Official Guide to the Louisiana Purchase Exposition This was the only "Official Guide" to the exposition. It is an original 1904 book of 200 pages which have been digitized. It contains an accurate and thorough survey of the World's Fairgrounds with detailed descriptions.
You can read the whole book for free on Google books.