. "The importance of ground water in the Great Lakes Region" . . . . . . "Importance of groundwater in the Great Lakes Region" . . . . . . . . . . . "Report outlining the role that groundwater plays in the overall hydrologic system of the Great Lakes region. Describes the main ground-water resources issues in the Great Lakes Region which are related to the amount of ground water, the interaction of ground water and surface water, changes in ground-water quality as development expands, and ecosystem health related to quantity and quality of water." . . . .