Aaron Solomon (ben Saul Joseph) Adelman's Oz Page: Chronological listing of books by L. Frank Baum and the authorized authors who continued his Oz series. Text format, organized by chapters. Related links.
Dave's Ozcongruities Page: A catalogue of inconsistencies in the Oz books.
Online Literature Library: L. Frank Baum: E-texts of the first 14 books in the Oz series.
PageByPageBooks.com: L. Frank Baum: E-texts for the original 14 books in the Oz series, as well as Baum's stories about Santa Claus.
Selfknowledge.com: L. Frank Baum: Texts of his Oz series and his two books about Santa Claus. Links to photographs and biographies.
The Famous Forty Cannon of Oz: Provides pictures and brief synopses of the 40 books in the Oz series.
UnderTheSun.cc: About L. Frank Baum: A short profile with a collection of his Oz works in e-text, his two stories of Santa Claus, as well as The Enchanted Island of Yew and The Master Key.