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- ecological poultry farming 2
- ecological problems 1
- ecological quality 1
- ecological risk innovations 1
- ecological risks 1
- ecological safety 2
- ecological state 1
- ecological state of rivers 1
- ecological system 1
- ecological thinking 1
- ecological tourism 1
- ecological- agrochemical indices 1
- ecologically-necessary water consumption 1
- ecologization of production 1
- ecology 17
- ecology and landscape analysis 3
- economic 1
- economic activities 1
- Economic Activity 1
- economic activity 5