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Creator
- United States. Army. Corps of Engineers 7
Donor
- Naff, Thomas 7
Topic
- Hydrology 7
- Water quality 6
- Climate 5
- Population 5
- Demography 4
- Groundwater 2
- Agriculture 1
- Precipitation (Meteorology) 1
- Riparian areas 1
- Shatt al-Arab (Iraq and Iran) 1
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