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- Agriculture8,639
- History6,880
- Forests and forestry6,790
- Economic aspects2,231
- Soils2,162
- Forest management2,157
- Fisheries2,076
- Research1,891
- Gardens1,836
- Environmental aspects1,569
- Hunting1,434
- Landscape architecture1,386
- Soil surveys1,193
- Trees1,137
- Control1,025
- Forest policy1,005
- Fishing999
- Management951
- Social aspects951
- Diseases and pests936