How Many Books Are There?

According to Google, the world contains about 129,864,880 books. Google calculated this number by combining duplicate entries from a data base of nearly one billion raw, bibliographic records and by eliminating about an additional 16.5 million non-books that had records in Google’s raw data base.

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  1. I wonder how many physical copies of books there are in the world? How could one go about estimating?

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