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- Agriculture8,570
- History6,819
- Forests and forestry6,763
- Economic aspects2,203
- Soils2,156
- Forest management2,124
- Fisheries2,067
- Research1,882
- Gardens1,827
- Environmental aspects1,529
- Hunting1,430
- Landscape architecture1,365
- Soil surveys1,193
- Trees1,133
- Control1,011
- Fishing996
- Forest policy982
- Management934
- Social aspects928
- Diseases and pests924