Book excerpt: In the fourth book in his bestselling survival series, master tracker and outdoorsman Tom Brown, Jr. goes beyond survival and unlocks his personal storehouse of experience to share the secrets of adaptation, the single most important survival skill. Includes details on: • How to construct your own superbly functional "Earthshelter" in any environment, in any season, with any materials • How to make your own tools, weapons, furniture, clothing, utensils, even works of art, from materials plentiful in the wilderness • How to use the plants, animals, and earth around you to nurture you both physically and spiritually, as so-called "primitive peoples" have done since the dawn of time. TOM BROWN'S FIELD GUIDES: America's most popular nature reference books, Tom Brown's bestselling field guides are specially designed for both beginners and experienced explorers. Fully illustrated and comprehensive, each volume includes practical information, time-tested nature skills, and exciting new ways to rediscover the earth around us.