However, this number can be a bit tricky. This count includes:
* The William books: The most famous series, with 59 books about the mischievous William Brown.
* Other series: Crompton also wrote series about "Just William's" sister, "Anne," and the "Secret of the Green Room."
* Standalone novels: She also published several novels not related to the William series.
So, depending on how you count, you could say she wrote a significant number of books.