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![Evaluacion de los recursos hirdicos: Manual para un estudio de apreciacion de las actividades nacionales. [Evaluation of Water Resources: A Manual for a Study of National Activities]](/thumbnails/2/3/oregondigital-df70rm732.jpg "Evaluacion de los recursos hirdicos: Manual para un estudio de apreciacion de las actividades nacionales. [Evaluation of Water Resources: A Manual for a Study of National Activities]")
4. Ground Water
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- Naff, Thomas 21
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- Hydrology 21
- Groundwater 9
- Watersheds 6
- Technology 5
- Water quality 5
- Population 3
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- Agriculture 2
- Contamination of environment 2
- Demography 2
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