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12. The difference between the potentiometric surfaces of the Aquia Aquifer, September 1982 and September 1997 in Southern Maryland
13. The difference between the potentiometric surfaces of the lower Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland
14. The difference between the potentiometric surfaces of the Magothy Aquifer, September 1975 and September 1997 in Southern Maryland
15. The difference between the potentiometric surfaces of the upper Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland
16. Digital geologic map database of the Payette National Forest and vicinity, Idaho
17. Digital geologic map of Yellowstone National Park, Idaho, Montana, and Wyoming and vicinity
18. Distribution of hydrogeologic units in the Black Hills area, South Dakota
19. Djibouti
20. Dominica
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