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10 Longest Pieces of Literature - Largest.org
The 10 longest novels ever written - Shortlist
UPDATE: Word count of the longest FanFiction ever written
10 Longest Books Ever Written - Largest.org
The longest novels ever written - Stars Insider
The Quick 10: The 10 Longest Novels Ever - Mental Floss
What Is the Longest Book in the World? | Smithsonian
World's Longest Book Is 1.3 Million Words - Mental Floss
10 of the Longest Books Written in English - TCK Publishing
Longest novel - Guinness World Records