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2. Preliminary lithogeochemical map showing near-surface rock types in the Chesapeake Bay Watershed, Virginia and Maryland
3. Potentiometric surface of the Magothy aquifer in southern Maryland, September 1989
4. The Potentiometric surface of the Magothy Aquifer in southern Maryland, September 1985
5. Potentiometric surface of the Magothy aquifer in southern Maryland during the fall of 1987
6. Potentiometric surface of the Magothy aquifer in southern Maryland during September 1988
7. Potentiometric surface of the Aquia aquifer in southern Maryland, September 1989
8. Potentiometric surface of the Aquia aquifer in southern Maryland during the fall of 1987
9. Potentiometric surface of the Aquia aquifer in southern Maryland during September 1988
10. Part of a printed map of Chesapeake Bay extending as far north as Philadelphia
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