98.6 Degrees: The Art of Keeping Your [censored] Alive by Cody Lundin is a great book. It is full of good, straight forward information that will help keep you alive and be found is a short(72 hrs.) survival situation. However, it lacks in specifics on things like fire and shelter building, finding water, and other important skills. It focuses more on the kit and how to use it. These skills, while they may be second nature to some, are not mastered by all. The SAS guide will teach you these skills and show you how to apply them in the field. This is why I recommend it as your first or only survival book. You don't have to stop there, you can buy and read as many books as you want, I have about a dozen in my collection. However reading is not enough alone, you have to practice and keep up on these skills also. Just my opinion.