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12. Relation between selected well-construction characteristics and occurrence of bacteria in private household-supply wells, south-central and southeastern Pennsylvania
13. Relation between selected well-construction characteristics and occurrence of bacteria in private household-supply wells, south-central and southeastern Pennsylvania
14. Relation of bacteria in limestone aquifers to septic systems in Berkeley County, West Virginia
15. Relation of mercury to other chemical constituents in ground water in the Kirkwood-Cohansey aquifer system, New Jersey Coastal Plain, and mechanisms for mobilization of mercury from sediments to ground water
16. Relation of shallow water quality in the central Oklahoma aquifer to geology, soils, and land use
17. Relations among rainstorm runoff, streamflow, pH, and metal concentrations, Summitville Mine area, upper Alamosa River basin, southwest Colorado, 1995-97
18. Relations among river stage, rainfall, ground-water levels, and stage at two Missouri River flood-plain wetlands
19. Relations for estimating unit-hydrograph parameters in New Mexico
20. The response of the Iao aquifer to ground-water development, rainfall, and land-use practices between 1940 and 1998, Island of Maui, Hawaii
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