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- easily breakable structure 1
- echargeable batteries 1
- eciprocating internal combustion engines 1
- ecological catastrophe 1
- Ecological characteristic 1
- ecological condition 2
- ecological condition, ecological norms, forecast, river Udy river basin, Kharkiv region 1
- ecological condition, waterflows, climate, anthropogenic pressure, hydrological indicators, Оskil, Kharkiv region 1
- Ecological control 2
- ecological criterion of prof. I.V. Parsadanov 1
- ecological criterion of Prof. Igor Parsadanov 1
- ecological criterion of prof. Igor Parsadanov 1
- ecological efficiency 1
- ecological indicators 1
- ecological monitoring 1
- ecological norms 1
- ecological regime 1
- ecological risk, aquatic ecosystem, ecological standard, Lopan river, Kharkiv region, Ukraine 1
- Ecological risk; river basin; rational use of water; water protection measures; surface waters; Kharkiv region; Udy river 2
- Ecological safety 1