Columbia subject headings:
Agenda 21.
Economic development--Environmental aspects--European Union countries.
Environmental policy--European Union countries.
Environmental policy--International cooperation.
Sustainable development--European Union countries--Planning.
Harvard subject headings:
Agenda 21
Economic development--Environmental aspects
Environmental policy--European Union countries
Environmental policy--International cooperation
Sustainable development--European Union countries
Princeton subject headings:
Agenda 21.
Economic development--Environmental aspects.
Environmental policy--European Union countries.
Environmental policy--International cooperation.
Sustainable development--European Union countries.