Another example of printed handwritten books are the Wainwright guides which were not typeset because the author didn’t trust the typesetter to not make mistakes.
https://hackaday.com/2017/01/18/forrest-mims-radio-shack-and...
http://www.zpag.net/Electroniques/Kit/The%20Forrest%20Mims%2...
The handwritten part starts on page 5 (page 14 of the PDF).
https://www.amazon.com/Ashley-Book-Knots-Clifford-W/dp/03850...