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Subject
- History32
- Agriculture11
- Gardens10
- Historic gardens6
- Landscape architecture5
- Parks5
- Conservation and restoration4
- Gardens, Italian4
- Management4
- Antiquities3
- Economic aspects3
- Fisheries3
- Olive3
- Conservation of natural resources2
- Environmental aspects2
- Farm mechanization2
- Forests and forestry2
- Government policy2
- National parks and reserves2
- Nature conservation2