Columbia subject headings:
Architecture and energy conservation--Europe, German-speaking.
Architecture, Domestic--Europe, German-speaking.
Solar energy--Passive systems.
Harvard subject headings:
Architecture and energy conservation--Austria.
Architecture and energy conservation--Germany.
Architecture and energy conservation--Switzerland.
Architecture, Domestic--Austria--Designs and plans.
Architecture, Domestic--Germany--Designs and plans.
Architecture, Domestic--Switzerland--Designs and plans.
Solar energy.
Solar heating.
Princeton subject headings: