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- Agriculture7,225
- History6,743
- Forests and forestry5,670
- Economic aspects2,112
- Soils2,108
- Forest management2,090
- Gardens1,814
- Fisheries1,610
- Environmental aspects1,502
- Research1,423
- Hunting1,343
- Landscape architecture1,332
- Soil surveys1,186
- Trees1,042
- Forest policy977
- Control951
- Social aspects920
- Management914
- Fishing902
- Diseases and pests863