Columbia subject headings:
Harvard subject headings:
Air conditioning equipment industry--United States.
Heating and ventilation industry--United States--History.
Heating and ventilation industry--United States.
International business enterprises--United States
Refrigerator industry--United States--History.
York International (Firm)--History.
Princeton subject headings:
Air conditioning equipment industry--United States.
Heating and ventilation industry--United States.
International business enterprises--United States.
York International (Firm)--History.