Water-Level Changes in the High Plains Aquifer, Predevelopment to 1994 (WRIR-95-4208): Dugan, J. T., Sharpe, J. B. (1:2,500,000; 1996). size 40" x 60". Description: This large, fold-out, contains several maps, graphs and tables. Sections of text include: Introduction, High Plains Water-Level Monitoring Program, Extent and Description of the High Plains Aquifer, Climate and th High Plains Aquifer, Hydrographs of Representative Observation Wells, Groundwater Irrigation Development and Water-Level Change Predevelopment to 1980, 1980 to 1994, and 1993-1994. Folded in manila envelope.