Do you know that you can do a Full-Text search from 120,000 Book Titles at Amazon?
This new service is called "Search Inside the Book" and allows you to search the full-text, over 33 million pages from over 120,000 titles. Of course, Amazon's primary motivation for offering this service is to sell books, but you can take advantage of the service for your own research purposes. Here is a link to their FAQs for this Search Inside the Book feature.