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The largest collection consists of 1.5 million books!
According to the Guinness World Records, the largest privately owned collection of books is a massive 1.5 million.
They are owned by John Q. Benham who lives in Indiana in the USA.
He has to keep them in lots of different places because he doesn’t have enough space in his house.
They are in the garage, in his two-storey building and even outside!