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Soil and Water Conservation Society
A non-profit, scientific and educational organization of professional conservationists.
http://www.swcs.org/
USGS -- Water Resources of the United States
Includes information on water use, with both historical and current data.
http://h2o.usgs.gov/
USGS Global Change Research Program
The U.S. Geological Survey's Global Change Research Program is an international source for ground-based and remotely sensed earth science data.
http://geochange.er.usgs.gov/