Yes, "Tool Steel Simplified" does have the naming convention problem. Aside from that though, I think it gives an excellent explanation of when certain types of steels (water hardening, oil hardening, air hardening, etc.) are appropriate to use, and why (or why not).
Try to make a living, not a killing. -- Utah Phillips
Don't believe everything you know. -- Bumper sticker
Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.