I got this book new in 1986. My dad had just brought home a Quay 90 computer, a wonderful Dual 8 inch floppy machine with a walnut cabinet and a key start.It has a Z80 in it, and we accessed it through an Intertube III Terminal made by Intertec Data Systems.(an insurance company had upgraded and they sold these off)None of that really matters, except that this manual is how I learned about CP/M, and I can tell you it really is useful.
It's a great book, in usable condition.