There are several web sites which have pages about or simply mention Susan Warner within them:
The Warner House. This site discusses Warner's home and the site-seeing possibilities afforded there.
Wide, Wide World." A Celebration of Women Writers.
This site is dedicated to publishing women's literary work on
the web. The 1892 Lippincott edition of The Wide, Wide World
is in full text here. Their listing also includes a JPEG of the
books' cover and frontispiece. A great listing.
Note: Links frequently move, or disappear entirely. No links collection is ever easy to update. If one of the above links doesn't work, try another. If you still can't find what you need, try a good search engine-- I like the Mamma Search Engine for new pages, and Google.com but some links will be "so-so". Then, remember to try the library! Not everything is available online. You sometimes need to pick up a real book.