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- ecological component of the concept of sustainable development 1
- ecological condition 1
- ecological conditions 1
- ecological consciousness 1
- ecological consequences 2
- ecological education 1
- ecological plasticity 1
- ecological policy 1
- 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