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- Acid rain
- Environmental aspects 7
- Acid deposition 3
- Pollution 3
- Air 2
- Acid pollution of rivers, lakes, etc 1
- Acid soils 1
- Atmospheric chemistry 1
- Deforestation 1
- Deterioration 1
- Experiments 1
- Forests and forestry 1
- Juvenile literature 1
- Materials 1
- Nitrogen cycle 1
- Research 1
- Soil acidification 1
- Soil management 1
- Sulphur cycle 1
- Troposphere 1
- Weathering 1
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