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- Forests and forestry5,756
- Agriculture5,357
- History4,681
- Forest management1,955
- Soils1,857
- Economic aspects1,644
- Research1,567
- Gardens1,508
- Environmental aspects1,404
- Fisheries1,380
- Landscape architecture1,232
- Soil surveys1,153
- Trees1,008
- Control927
- Forest policy822
- Management818
- Social aspects800
- Diseases and pests773
- Hunting759
- Conservation of natural resources624