[PDF] Principles of Quantum Mechanics: As Applied to Chemistry and Chemical Physics Donald D. Fitts

Despite its title, this book contains few applications to chemistry. What distinguishes it from most QM texts is the absence of physics-specific applications like solid state, and the careful, step-by-step process by which the author derives results. I’d recommend it to anyone (chemist, physicist, whatever) who wants to know nonrelativistic quantum theory. It’s also a handy reference for a few subjects that have wide use outside QM, like group velocity and spherical harmonics. The style is a bit dry, and I doubt that I’ll ever read it cover to cover, but as a textbook it’s hard to beat.