1. U. S. Geological Survey; Princeton New Jersey USA
2. U. S. Geological Survey; Reston Virginia USA
3. Stockholm International Water Institute; Stockholm Sweden
4. Institute for Agricultural and Forest Environment, Polish Academy of Sciences; Poznan Poland
5. Potsdam Institute for Climate Impact Research; Potsdam Germany
6. Department of Geography; University of California at Los Angeles; Los Angeles California USA
7. National Oceanic and Atmospheric Administration; Princeton New Jersey USA
8. U. S. Geological Survey; La Jolla California USA