The BiblioVault repository contains a growing collection of older, recently published, and new books from participating scholarly presses. The Scholars' Portal, now in its beta-test phase, enables you to pinpoint books that are of interest to you.
You can do full-text searches over the BiblioVault collection and learn which books contain the search topic. To do a quick search, select a book element-full-text, title, author, copyright year, or ISBN-from the pull-down menu and then enter a word or phrase in the box. Finally, click on the Quick Search button. A list of the book(s) that are consistent with that search will result. Clicking on the title for a book will take you to that book's page in the Scholars' Portal. From there you can go to the publisher's home page and even order the book.
Clicking on In-Depth Search will enable you to do a complex search. Or you can browse the collection by title, author, or publisher by clicking on the appropriate button.
It's not a large collection as yet, but an interesting one that can shed light on current issues. Click this link to visit The BiblioVault home page: http://www.bibliovault.org/BV.index.epl.