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- Agriculture5,334
- Forests and forestry4,897
- History3,877
- Soils1,885
- Forest management1,785
- Economic aspects1,545
- Research1,533
- Fisheries1,365
- Environmental aspects1,340
- Soil surveys1,174
- Hunting1,093
- Gardens1,048
- Trees955
- Control935
- Landscape architecture893
- Fishing854
- Management815
- Diseases and pests809
- Forest policy731
- Social aspects693