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- Agriculture7,154
- History6,360
- Forests and forestry2,860
- Gardens1,787
- Soils1,609
- Economic aspects1,583
- Fisheries1,446
- Landscape architecture1,333
- Hunting1,187
- Soil surveys1,136
- Environmental aspects1,069
- Research1,032
- Forest management960
- Fishing819
- Horses788
- Social aspects772
- Management622
- Rice621
- Gardening618
- Veterinary medicine611