This is kind of sparse, pardon the pun. The previous chapter covers one Unix filesystem and that's it, as if that's all there was in 1974-1984. The 1984 chapter

This is kind of sparse, pardon the pun. The previous chapter covers one Unix filesystem and that's it, as if that's all there was in 1974-1984. The 1984 chapter is again just one BSD Unix filesystem. How about something lesser known, but excellent?