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- Agriculture8,451
- History6,799
- Forests and forestry6,499
- Economic aspects2,208
- Forest management2,139
- Soils2,135
- Fisheries2,037
- Research1,878
- Gardens1,795
- Environmental aspects1,563
- Hunting1,381
- Landscape architecture1,376
- Soil surveys1,189
- Trees1,080
- Control1,021
- Forest policy998
- Fishing964
- Social aspects946
- Management944
- Diseases and pests921