Recently the work "Hapkido" written by Marc Tedeschi was published by Weatherhill.
This is a massive work of 1136 pages covering Mr. Tedeschi's vision as to Hapkido's Traditions, Philosophy and Technique.
The work is so incredibly complex in the material covered, I fairly do not know where to begin. But if you want something to consider, in depth analysis, and great photography, this book is something that you should consider.
While there is so much to consider here, and I do not mean to say I necessarily agree with everything he has written, the effort he made to prepare this exceeds any work I've seen in English on the Martial Arts.
The only work I've seen in similar scope would be the entire body of material written by Dr. Yang Jwing-Ming.
To show you what I mean, here are the Chapter headings of the book.
Part 1. Overview
Philosophy(asian & hapkido),
Anatomy (overview, eastern concepts, meridians, acupoints, pressure point fighting, acupoint reference
Part 2. Basic Elements
Breathing * Meditation
Strikes (Arm, Leg, Head & Body, Combination)
Avoiding & Blocking
Holds (Chokes & Head Locks)
Part 3. Self Defense
Self Defense Overview
Defense Against Punches
Defense Against Kicks
Defense Against Holds
Defense Against Chokes
Defense against Joint Locks
Defense Against Throws
Defense using one or no arms
Protecting Another Person
Part 4. Weapons
Hapkido Weapons Overview
Short Stick Techniques
Long Staff Techniques
Common Objects as Weapons
Defense Against Handguns
This is such a dense treatment of a system, it would take a very large effort to review and qualify what is presented.
I believe there is much here to challenge our own knowledge and present a real template to the author's knowlege.
Bushi No Te Isshinryu www.funkydragon.com/bushi