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- ecological security 1
- ecological sphere 1
- ecological state 3
- ecological state of water 2
- ecological state, ecological risk, ecological index, ecological standard, the Udy river basin, Khar-kov region 2
- Ecological state, ecological risk, ecological index, ecological standard, the Udy river basin, Kharkov region 1
- ecological state, surface waters, small rivers, water protection 1
- ecological status 1
- Ecology 3
- ecology 1
- economic and social mechanisms 1
- economic assessment 1
- economic assessment, risk, infectious morbidity, recreational water use, Kharkiv, Ukraine 1
- economic development 1
- economic development of territorial communities 3
- economic effect 2
- economic factors 1
- economic impact 1
- economic instruments, 1
- economic mechanism 1