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- ecological processes and systems 1
- ecological programs 1
- ecological relationship 1
- ecological risk 2
- ecological safety 17
- ecological tax 3
- ecological technologies 2
- ecological tourism 3
- ecological-economic assessment 1
- ecological-economic safety 2
- ecological-economic security 3
- ecologically hazardous water-retaining enterprises 1
- ecologically oriented world outlook 1
- ecologically-oriented development 1
- ecologically-oriented management 1
- ecologization 1
- ecologization of production 1
- ecology 17
- ecology-economic policy 1
- ecolo¬gical aspects of the economy 1