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1.

Perspective: All of Earth's Water in a Single Sphere (ga.water.usgs.gov)

261 points

14 years ago

2.

Estimated concentrations of atrazine in agricultural groundwater (water.usgs.gov)

146 points

a year ago

3.

How much water is there on the Earth? (water.usgs.gov)

41 points

11 years ago

4.

Floods: Recurrence intervals and 100-year floods (USGS) (water.usgs.gov)

2 points

9 years ago

5.

USGS NAWQA: Groundwater-Quality Trends (water.usgs.gov)

1 point

14 years ago

6.

U.S. Geological Survey Endangered, Discontinued and Rescued Streamgages Mapper (water.usgs.gov)

1 point

4 years ago