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"To give you some sense of scale, the Hillary (Rodham Clinton) book, as big as that has been - and that has been very big - in the first week, we will probably sell about 20 times as many copies of the Harry Potter book."
[madison.com...]
Not quite:
[ipl.org...]
Louis L'Amour is pretty popular too.
1983... L'Amour became America's most popular author. All of his novels, and he wrote over 100, are still in print. Total sales have topped 225,000,000. Between 1953 and 1971 thirty of his novels were turned into movies.