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2. The Midwestern basins and arches regional aquifer system in parts of Indiana, Ohio, Michigan, and Illinois : summary
3. Ground-water pumpage in the Willamette lowland regional aquifer system, Oregon and Washington, 1990
4. Hydrogeologic framework of the Edwards-Trinity aquifer system, west-central Texas
5. Estimated natural ground-water recharge, discharge, and budget for the Dixie Valley area, west-central Nevada
6. Nonlinear-regression flow model of the Gulf Coast aquifer systems in the south-central United States
7. Regional Aquifer-System Analysis Program of the U.S. Geological Survey, 1978-1992
8. Regional Aquifer-System Analysis Program of the U.S. Geological Survey, 1978-1992
9. Properties and chemical constituents in ground water from the lower Wilcox Aquifer, Mississippi Embayment Aquifer System, south-central United States
10. Bedrock-surface altitude in the midwestern basins and arches region of Indiana, Ohio, Michigan, and Illinois
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