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World Water Resources and Their Use
Information on quantities and forms of water worldwide, including discharge of rivers, as well as water use and demand. From UNESCO and Russian State Hydrologic Institute.
http://www.espejo.unesco.org.uy/
Wyoming Water Resources Data System
The Water Resources Data System is a clearinghouse of hydrological and climatological data for the State of Wyoming
http://www.wrds.uwyo.edu/