Tarzan and the Jewels of Opar - Chapter-indexed HTML text. Project Gutenberg edition. - http://www.cs.cmu.edu/People/rgs/tar5-table.html
Literature Network: Tarzan and the Jewels of Opar - Chapter indexed HTML of the complete text. Includes a search feature. - http://www.online-literature.com/edgar_rice_burroughs/tarzan_jewels_opar/