What does it mean to be a New York Times best seller?

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Tags

1. #keeps
2. #author
3. #formula
4. #period
5. #generally
6. #sellers
7. #label
8. #thought
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10. #itself
11. #during
12. #certain
13. #copies
14. #written
15. #while
16. #secret
17. #bestseller
18. #times