Book excerpt: It's the definitive guide for anyone who wants to master the principles and techniques of dowsing for use in agriculture, camping, or replacement of polluted or diminishing water sources. It's first a matter of a few basics of geology and land formation, and then learning how to make and use the simple dowsing equipment you need, and the different techniques that work in various sites and locations. But, most of all, it's about awakening your undeveloped intuitive and psychic skills and putting them to use in order to "contact" the underground sources where up to 90 percent of earth's fresh water is stored.