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While he did, Harry Potter books are huge. Looking at the best selling books article on Wikipedia, all of the Discworld books sold 90 million total copies, the first Harry Potter sold 120 million. So I'm guessing that claim is only for books sold during the 90's, but Rowling sold far more copies of books published in the 90's

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Yes I agree that is how it is being claimed.

Interestingly; the first HP book was published in 1997 but the print run was only 500. The book wasn't published in the US till late 1998 and by that point hadn't even sold half a million copies.

I believe it kind of blew up in sales through 1999 but the UK -> US lag meant most of the sales were in the 2000s.

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