Indiana University
Wright American Fiction Collection: Mark Twain
The full texts to Twain's lesser-known works can be accessed from this site such as "Celebrated Jumping Frog" and "The Innocents Abroad." Read facsimiles of the original books or plain text versions.
Open Library of the Internet Archive
Open Library: Celebrated Jumping Frog of Calaveras County
This ebook version of Mark Twain's "Celebrated Jumping Frog Of Calaveras County" 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.