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- ecological requirements 1
- ecological requirements and motives 1
- ecological ripeness of forest 1
- ecological species 1
- ecological state 1
- ecological state of landscapes 2
- ecological structure 3
- ecological structure. 1
- ecological thinking 1
- ecological trail 1
- ecological trails 1
- ecological values 1
- ecological-cenotic characteristics 1
- ecologically based activities 1
- ecologization 2
- ecology 5
- ecology department 1
- ecomonitoring 1
- econometric estimates 2
- econometric methods 1