Standard searches usually bury these directories under layers of blog posts and ads. To find them, you need to use "Google Dorks"—special search operators that tell the search engine to look for specific server patterns.
intitle:"index of" +(mobi|pdf|epub) -inurl:(jsp|php|html) "book title" parent directory index of downloads free
Always check for a README.txt or index.html in the parent directory – responsible admins sometimes leave notes. Otherwise, consider it the Wild West of downloads. parent directory index of downloads free
: This link at the top of the list takes you one level up in the folder hierarchy, much like clicking "back" in a file explorer. Open Directory parent directory index of downloads free