Check your local library. That is where I found the copy that I read. The book was published some time ago, so in that sense, it is not current. I probably read it a year ago. I think it is fairly good at educating someone on the basic concepts. That is a strength and weakness--good enough for a beginner, not much help for someone with some basic knowledge. Having read it, I don't think I would buy it, but only because it is just not that deep. Of course, that goes with the basic premise of the book, which is that sharpening is ridiculously easy and any yahoo can do it. After a discussion of the basic concepts, the rest of the book is dedicated to brief chapters on how to sharpen specific tools, things like scissors, axes, chain saws, etc.
Hope this helps.