http://www.online-literature.com/verne/ Even has many of his works online. Watch the dates, though; Twenty-thousand Leagues Under the Sea wasn't written until 1873
This site has a Chronological list of British and Irish Authors:
BRITISH AND AMERICAN LITERATURE 1800-1899: A web guide to 19th century British and American literature from literaryhistory.com :
Romantic Circles: Devoted to the study of Lord Byron, Mary Wollstonecraft Shelley, Percy Bysshe Shelley, John Keats, their contemporaries and historical contexts.
I've become an online researcher, I'm afraid. Living in a small town with a sucky library can do that to you…