This is the sixth in a series of Conservation Yearbooks prepared by the U.S. Department of the Interior as environmental reports to the public concerning problems of water resources in the United States. Information presented includes descriptive information, statistical data, and extensive color photographs. The methods of presenting information make the yearbook suitable for all age levels. Included are sections on The Story of Water; The Hydrologic Cycle; Water: The Environmental Challenge; Water Rich or Water Poor?; The Unending Struggle for Quality; Fish, Wildlife . . . and People; Water at Work for Man; and Islanders and Indians. (BB)