Columbia subject headings:
Energy conservation--Europe, Central.
Energy conservation--Europe, Eastern.
Energy conservation--Technological innovations.
Energy industries--Europe, Central.
Energy industries--Europe, Eastern.
Energy policy--Europe, Central.
Energy policy--Europe, Eastern.
Renewable energy sources--Research.
Harvard subject headings:
Energy conservation--Government policy--Europe, Central--Case studies.
Energy conservation--Government policy--Europe, Eastern--Case studies.
Princeton subject headings:
Case studies.
Energy conservation--Government policy--Europe, Central--Case studies.
Energy conservation--Government policy--Europe, Eastern--Case studies.