I remember reading those books (ok, it was the 4.3 BSD edition instead of 4.4) alongside Bach's "The Design of the Unix Operating System" and Uresh Vahalia's "U

I remember reading those books (ok, it was the 4.3 BSD edition instead of 4.4) alongside Bach's "The Design of the Unix Operating System" and Uresh Vahalia's "UNIX internals: the new frontiers" (1996). I recommend "UNIX internals". It's very good and not as well known as the others.