Where can I find the texts of Oz books online?
Most of public domain Oz books, and many non-Oz books by Baum, have been made available to read online. Project Gutenberg is trying to get as many public domain works online as possible, and these include many books by Baum. For a list of what’s available, check out the official Project Gutenberg site (http://www.gutenberg.net/) or the Online Public Library (http://digital.library.upenn.edu/books), or any other site you may find by typing “Project Gutenberg” into a search engine. Several other sites have these texts as well, and some sites have other Oz and Oz-related books not published by Project Gutenberg, such as some of those on http://www.emeraldcityofoz.com/library/ and http://dorothyozma.tripod.com/library.htm. Other sites carry some books in other languages. For a list of Oz and Baum works known to be online, check the WWOOW links page (http://thewizardofoz.info/links.html).