Blackdog Media
Classic Reader: Ozma of Oz by L. Frank Baum
Classic Reader provides numerous classic works from famous authors. This L. Frank Baum work from the early 1900s is the third book from his Oz series.
Open Library of the Internet Archive
Open Library: Ozma of Oz
This ebook version of L. Frank Baum's "Ozma Of Oz" has been made available in multiple formats by the Open Library. Editions of the full novel, organized by year of publication, may be accessed here.