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- ecological services 1
- ecological technologies 1
- ecological tourism 2
- ecological values 1
- economic theory 1
- economic and legal aspect 1
- economic crisis 2
- economic development 1
- economic efficiency 3
- economic efficiency of air transport 1
- economic theory 3
- economy 3
- ecoprofessional consciousness 1
- ecotourism 2
- EDTO 1
- education 5
- education ecologization 1
- education in the post-coronavirus world 2
- education management system 1
- education of an airspecialist 1