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- ecological knowledge 1
- ecological monitoring 1
- ecological motives 1
- ecological path 1
- ecological ren 1
- ecological rent 1
- 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