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- Agriculture8,616
- Forests and forestry6,778
- History6,743
- Economic aspects2,221
- Soils2,158
- Forest management2,152
- Fisheries2,070
- Research1,890
- Gardens1,804
- Environmental aspects1,539
- Hunting1,429
- Landscape architecture1,368
- Soil surveys1,193
- Trees1,133
- Control1,020
- Forest policy1,002
- Fishing994
- Management940
- Diseases and pests934
- Social aspects921