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| 1 | - | http://gisgeography.com/agriculture-maps-global-farming/ |
+ | http://gisgeography.com/agriculture-maps-global-farming/
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| 2 | + | |||
| 3 | + | Food and Agriculture Organization of the United Nations- AQUASAT- global water information system:
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| 4 | + | http://www.fao.org/nr/water/aquastat/main/index.stm |