Fightclub for Imperial Age.
Information on Fisticuffs, Bartitsu, and swordplay. Plenty of background and history and bunch of new feats.
Very useful in a game where guns might be rare.
All the Imperial Age books are all well written and features art from the age, either public domain art and paintings as well as some original art. In all cases the art is very evocative of the time and very well done.
The books are all easy to read, with clean layout and font sizes. They can be printed with ease without killing your printer cartridge.