I think so, it's some years since I was near a copy.
As I recall, the cover price of Prouty's "Helicopter dynamics" books was somewhat less than I'd consider a fair assessment of the value. Anyhow, NRF seems to have solved the problem for us both anyway.
Since you are clearly happy with maths as a descriptive language, I would also strongly recommend Simon Newman's "Fundamentals of Helicopter Flight". I'll admit a personal bias - Simon is a friend who has taught me much in the dozen years I've known him - including most of what I know about helicopter aerodynamics. But, despite that, I'm still sure you'd find it both readable and very informative.
G