Jabberwok, sounds like you have the 1970s original of the book, in 4 volumes. It was reprinted a few years ago in one hardback volume, which is a more convenient format. Sure quite a number here have one or the other, and a greedy few may have both
I've used it to help answer many a question here on AH&N.
Jamesair, give Janet in the shop my regards. It's the shop who are also the publishers of the book.