While imperfect, the websites and their search engines have already opened extraordinary possibilities to readers and researchers in online communities worldwide.

- Google Book Search (http://books.google.com). By far the most known online library to date, the Google book project has scanned the pages of "thousands" of works into digital format.

Text from classics in the public domain is available in full. Summaries or snippets of books still under copyright are provided of books still under copyright protection.

A search engine taking the place of library card indexes makes it possible to seek authors' names, publication dates, or words or expressions in the texts or titles.

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