After seeing the mention here, I went ahead and bought a used copy in "Used - Good" condition off Amazon. I find myself glad I did not pay full price as I was not impressed with the editing (a three-view of the XF12F-1 labeled as the XFR-1, for example). I'll keep it, but it won't be a main reference at all.
If I'm honest, I can not recommend this book to anyone.
Author Bill Holder did a number of softcover books for Schiffer. Some were pretty good, like one on airborne weapons and one on midair refueling, but his book "Firepower" is probably the worst aviation book I ever bought (and promptly discarded)!