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- Agriculture8,627
- Forests and forestry6,785
- History6,309
- Economic aspects2,229
- Soils2,160
- Forest management2,156
- Fisheries2,075
- Research1,889
- Environmental aspects1,546
- Hunting1,424
- Soil surveys1,192
- Trees1,123
- Gardens1,087
- Control1,025
- Forest policy1,005
- Fishing989
- Management944
- Diseases and pests934
- Social aspects930
- Horses808