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- Agriculture8,343
- History6,791
- Forests and forestry6,460
- Economic aspects2,053
- Forest management1,952
- Fisheries1,922
- Gardens1,831
- Research1,732
- Environmental aspects1,438
- Hunting1,425
- Landscape architecture1,377
- Trees1,090
- Soils1,053
- Fishing979
- Control945
- Forest policy923
- Social aspects922
- Diseases and pests867
- Horses805
- Rice737