1. Vulnerability of ground water to contamination, Edwards aquifer recharge zone, Bexar County, Texas, 1998 Author/Creator: Clark, Allan K., author Publication/Creation: Austin, Texas : U.S. Deptartment of the Interior, U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
2. Vulnerability of ground water to contamination, northern Bexar County, Texas Author/Creator: Clark, Amy R. 1961- (Amy Richter) Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Resource Type: Book Access & Availability: Loading
3. Vulnerability of ground water to contamination, northern Bexar County, Texas Author/Creator: Clark, Amy R. 1961- (Amy Richter) Publication/Creation: Austin, Tex. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading
4. Variations in sand storage measured at monumented cross sections in the Colorado River between Glen Canyon Dam and Lava Falls Rapid, northern Arizona, 1992-99 Author/Creator: Flynn, Marilyn E. Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Resource Type: Book Access & Availability: Loading
5. Vulnerability of ground water to atrazine leaching in Kent County, Michigan Author/Creator: Holtschlag, David J., author Publication/Creation: Lansing, Michigan : U.S. Geological Survey, 1997 Resource Type: Book Access & Availability: Loading
6. Variability of streamflow and precipitation in Washington Author/Creator: Kresch, David L., author Publication/Creation: Tacoma, Washington : U.S. Geological Survey, 1994 Resource Type: Book Access & Availability: Loading
7. Variability in base streamflow and water quality of streams and springs in Otter and Rosebud Creek basins, southeastern Montana Author/Creator: Lambing, John H., author Publication/Creation: Helena, Montana : U.S. Geological Survey, 1986 Resource Type: Book Access & Availability: Loading
8. Variation in the relation of rainfall to runoff from residential lawns in Madison, Wisconsin, July and August 1995 Author/Creator: Legg, Andrew D., author Publication/Creation: Madison, Wisconsin : U.S. Department of the Interior, U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
9. Variations in land use and nonpoint-source contamination on the Fort Berthold Indian Reservation, west-central North Dakota, 1990-93 Author/Creator: Macek-Rowland, Kathleen, author Publication/Creation: Bismarck, North Dakota : U.S. Geological Survey, 1996 Resource Type: Book Access & Availability: Loading
10. Variability of pesticide detections and concentrations in field replicate water samples collected for the National Water-Quality Assessment Program, 1992-97 Author/Creator: Martin, Jeffrey D. Publication/Creation: Indianapolis, Ind. : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Resource Type: Book Access & Availability: Loading