Buy it used as a reference if your work involves kinetic wave physics. But for a single textbook to learn the field today, the community has largely moved to P.M. Bellan’s "Fundamentals of Plasma Physics" (more modern and physical) or D.R. Nicholson’s "Introduction to Plasma Theory" (similar scope but more readable).
Yes, Krall and Trivelpiece ( by Nicholas A. Krall and Alvin W. Trivelpiece) is widely considered a solid, classic graduate-level textbook , though with important caveats about its age and style. krall and trivelpiece principles of plasma physics