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- Agriculture8,647
- History6,882
- Forests and forestry6,785
- Economic aspects2,230
- Soils2,162
- Forest management2,152
- Fisheries2,076
- Research1,891
- Gardens1,836
- Environmental aspects1,569
- Hunting1,434
- Landscape architecture1,387
- Soil surveys1,193
- Trees1,136
- Control1,026
- Forest policy1,002
- Fishing999
- Social aspects951
- Management947
- Diseases and pests935