- Science, multidisciplinary 2,944
- Science, Humanities and Social Sciences, multidisciplinary 2,941
- Applied Science, multidisciplinary 2
- Engineering Economics, Organization, Logistics, Marketing 2
- Environmental Economics 2
- Sustainable Development 2
- Waste Management/Waste Technology 2
- Environment, general 1
- Environmental Management 1
- Quality Control, Reliability, Safety and Risk 1
- Systems Theory, Control 1