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12. Relation of distribution of radium, nitrate, and pesticides to agricultural land use and depth, Kirkwood-Cohansey aquifer system, New Jersey coastal plain, 1990-91
13. Relation of ground-water flowpaths and travel time to the distribution of radium and nitrate in current and former agricultural areas of the Kirkwood-Cohansey Aquifer System, New Jersey Coastal Plain
14. Relation of hydrogeologic characteristics to distribution of radioactivity in ground water, Newark Basin, New Jersey
15. Relation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin
16. Relation of physical and chemical characteristics of streams to fish communities in the Red River of the North Basin, Minnesota and North Dakota, 1993-95
17. Relations of nonpoint-source nitrate and atrazine concentrations in the High Plains aquifer to selected explanatory variables in six Nebraska study areas
18. Relations of Tualatin River water temperatures to natural and human-caused factors
19. Results and interpretation of preliminary aquifer tests in boreholes UE-25c #1, UE-25c #2, and UE-25c #3, Yucca Mountain, Nye County, Nevada
20. Results of borehole geophysical logging and aquifer-isolation tests conducted in the John Wagner and Sons, Inc. former production well, Ivyland, Pennsylvania
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