Source: /cirosantilli/google-books

= Google Books
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They scanned a bunch of books, and then allowed search results to hit them. They then only show a small context around the hit to avoid copyright infringement.

Bibliography:
* https://www.theatlantic.com/technology/archive/2017/04/the-tragedy-of-google-books/523320/ Torching the modern-day <Library of Alexandria> (2015) by <James Somers>
* <The Google Story> Chapter 21. A Virtual Library paints a good picture of the people involved