This book is a comprehensive guide to First Aid in the wilderness. It points out many injuries and illnesses that you'd commonly find while in the wilderness, and easy-to-follow explainations of what they are, what caused them, how to prevent them, and how to treat them. This is perfect for a Boy Scout or Girl Scout class in First Aid for an upcoming trip; as I use it as the text for the class I teach.
The only area I would say that it is lacking in is the serious, life-threatening injuries, ie cardiopulmonary arrest, tension pneumothorax, etc. However, to be perfectly honest, in the wilderness, injuries like that are very difficult to survive if you are not easily acessable by EMS. Additionally, those injuries are complex, and the treatments aren't always easy to do in the wilderness, much to the contrary, in fact. So understanding them might be important to the field leader, but I don't dwell on the severe injuries too much when I teach because they are difficult to understand, and the treatment is always "Get them to an ambulace and to a hospital as fast as you can."
I highly recommend this book for all Wilderness First aid, and for Mountaineering First Aid.