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2. Quality-assurance design applied to an assessment of agricultural pesticides in ground water from carbonate bedrock aquifers in the Great Valley of eastern Pennsylvania
3. The quality of ground water in the principal aquifers of northeastern-north central Washington
4. The quality of ground water in the principal aquifers of southwestern Washington
5. Quality of ground water in agricultural areas of the San Luis Valley, South-Central Colorado
6. Quality of water from shallow wells in urban residential and light commercial areas in Lafayette Parish, Louisiana, 2001 through 2002
7. Quality of water from shallow wells in urban residential and light commercial areas in Lafayette Parish, Louisiana, 2001 through 2002
8. Quality of ground water in the coastal plain physiographic province of Virginia
9. Quality of freshwater in aquifers of Louisiana, 1988
10. Quality of water resources of the Ouachita National Forest, Arkansas
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