We would suggest knowing about and using more than one online book services. A searcher has plenty to choose from. This is no different than using more than one web search engine.
Here are just a few other favorites ResourceShelf favorites we've compiled.
Live Book Search also will show how much (all, 10%, 20%, 40%, words around search terms) can be viewed online. Like other services, books that offer 100% of their content online (primarily titles where the copyright has expired) can often be downloaded as PDF files at no charge.
The Online Books Pageis the place to begin for freely accessible full text books online. Don't forget to review the new listings page with hundreds of books listed weekly (including Gutenberg and Google Library Program titles, RSS feed, too!)
ebrary Discover offers over 20,000 NEW full text books for free (pay only to print or copy, about $.25 cents/U.S.).
NetLibrary is a service that many libraries offer at no charge, for free, without having to visit the library. Full text, full image without a limit on how much you can read, annotate, etc. The same goes for Safari Tech Books and Books24x7. The latter two services also offer individual subscriptions.
Finally, the Digital Book Index lists over 137,000 online books with nearly 100,000 available free.
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