Columbia subject headings:
Architecture and energy conservation--Europe.
Architecture, Domestic--Europe.
Architecture--Environmental aspects--Europe.
Ecological houses--Europe--Design and construction.
Sustainable design--Europe.
Harvard subject headings:
Architecture and energy conservation--Europe.
Architecture, Domestic--Europe
Architecture--Environmental aspects--Europe.
Ecological houses--Europe--Design and construction.
Sustainable design--Europe.
Princeton subject headings:
Architecture and energy conservation--Europe.
Architecture, Domestic--Europe.
Architecture--Environmental aspects--Europe.
Ecological houses--Europe--Design and construction.
Sustainable design--Europe.