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| 551.52710968257 (1) |
| Extra-terrestrial solar radiation (HO) (1) |
| Global radiation -- South Africa -- Limpopo (1) |
| Global solar radiation (H) (1) |
| Greenhouse, Atmospheric -- South Africa -- Limpopo (1) |
| Kr –Empirical constant (1) |
| Solar energy (1) |
| Solar energy -- South Africa -- Limpopo (1) |
| Solar radiation -- South Africa -- Limpopo (1) |
| Temperature based model (1) |
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