Columbia subject headings:
Air conditioning--Societies, etc.
Heating--Societies, etc.
Ventilation--Societies, etc.
Harvard subject headings:
Air conditioning--Societies, etc.
Heating--Societies, etc.
Ventilation--Societies, etc.
Princeton subject headings:
Air conditioning--Societies, etc.
Heating--Societies, etc.
Ventilation--Societies, etc.