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- Soils -- Heavy metal content 3
- Soils -- Heavy metal content -- South Africa 1
- Soils -- Leaching 1
- Soils -- Manganese content 1
- Soils -- Polycyclic aromatic hydrocarbon content 1
- Soils -- Quality -- South Africa 1
- Soils -- South Africa -- Organic compound content 1
- Soils -- Testing 1
- Soils -- Trace element content 1
- Soils -- Zinc content 1
- Soils and nutrition 1
- Soils pollution -- Environmental aspects -- South Africa 1
- Solar air conditioning 2
- Solar batteries 1
- Solar cells 3
- Solar cells -- Design and construction 1
- Solar collectors 3
- Solar collectors -- Africa, Sub-Saharan 1
- Solar energy 23
- solar energy 1