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Creator
- Kolars, John F. 6
- Abu Bakr, Yahya 1
- Mitchell, William A. 1
Donor
- Naff, Thomas 6
Topic
- Watersheds 6
- Groundwater 5
- Irrigation 4
- Agriculture 3
- Climate 2
- Hydrology 2
- Precipitation (Meteorology) 2
- Water-power 2
- Aquifers 1
- Arabian Peninsula 1
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