* His prolific career: Deary has been writing for decades and published books in multiple genres, including children's fiction, history, humor, and more.
* Multiple series: He's best known for the "Horrible Histories" series, but has also written many other series and standalone books.
* Adaptations and reissues: His work has been adapted for TV, theater, and other media, and some books have been reissued under different titles or formats.
However, some estimates put the total number of Terry Deary's published books around 200. This is a significant figure, but it's important to remember that it's likely a rough approximation, and the exact number may be higher or lower.