| AQUASTAT |
FAO's global information system on water and agriculture |
| FAOSTAT |
Food and Agriculture Organisation |
| GCMD |
Global Change Master Discovery (NASA) |
| HWSD |
Harmonized World Soil Database |
| IFA |
International Fertilizer Industry Association |
| IPG |
Institute of Physical Geography Hydrology Group (Goethe-University Frankfurt) |
| GDR |
UC Berkeley Geospatial Data Repository |
| USDA |
United States Department of Agriculture; http://www.pecad.fas.usda.gov/cropexplorer/ |
| EEA |
European Environment Agency |
| WRI |
Earth trends The Environmental Information Portal |
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