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Page By Page Books: The Underground City
http://www.pagebypagebooks.com/Jules_Verne/The_Underground_City/
Chapter-indexed and paged HTML text of the work.
The Underground City
http://www.selfknowledge.com/ucity10.htm
The complete online HTML text.
The Underground City
http://www.online-literature.com/verne/undergroundcity/
Chapter-indexed HTML of the complete text.
The Underground City, or, The Child of the Cavern
http://www.gutenberg.net/browse/BIBREC/BR1355.HTM
Plain text file at Project Gutenberg.