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- Tropics
- Tropical crops 24
- Agriculture 18
- Pastures 15
- Forests and forestry 13
- Legumes 12
- Forage plants 10
- Soils 10
- Tropical plants 9
- Control 7
- Diseases and pests 7
- Ecology 7
- Livestock 7
- Research 7
- Economic aspects 6
- Food crops 6
- Botany 5
- Feeding and feeds 5
- Forest ecology 5
- Forest management 5
- Trees 5
- Animal nutrition 4
- Architecture, Tropical 4
- Bibliography 4
- Climate 4
- Food 4
- Forest conservation 4
- Pictorial works 4
- Rain forests 4
- Root-crops 4
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