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Subject
- History78
- Agriculture63
- Forests and forestry35
- National parks and reserves16
- Economic aspects13
- Fisheries13
- Soils9
- Breeding8
- Forest management8
- Landscape architecture8
- Nature conservation8
- Parks8
- Rural conditions8
- Forest ecology7
- Collective farms6
- Conservation of natural resources6
- Gardens6
- Hunting6
- Livestock6
- Agriculturists5