Post your requests here if you can't find it through google, and maybe someone will help you. Your request must be in the public domain. If you're not sure if it is, then google public domain and look up the book's publishing date.
I'm requesting anything by Mark Twain, specifically "The Great Dark".
Project Gutenberg.
Any book whose copyright+etc has expired is likely to be found here.
For twain...
http://www.gutenberg.org/browse/authors/t#a53