Open directories are often the result of a sysadmin's oversight. They run on limited bandwidth.
Go to Google (or Bing, though Google has the best indexing) and type exactly: intitle index of pdf books
intitle:"index of" (pdf|epub) inurl:library intitle:"index of" inurl:ebooks Open directories are often the result of a
When a web server doesn't have a dedicated landing page (like an index.html ), it often displays a raw list of the files stored in that folder. By adding "PDF" and a book title to this query, you are essentially asking Google to find open server folders containing those documents. How to Use the Search String intitle index of pdf books