A Web site index – often called an “A-Z site index” – is a finding aid for a Web site, intranet, or sub-site, organized in the same way as a traditional, alphabetical back-of-the-book index.Truly  web Indexing of books publishers website is a dark area. So the present situation is compelled the user to stick on search engines to find out books on their interested stream. hope this site will help you to find out the books on Institutional repository with a hyper link to the original source