Columbia subject headings:
Automobile industry and trade--United States.
Labor unions--Automobile industry workers--United States.
Labor unions--United States--History.
Labor unions--United States.
Supervisors, Industrial--Labor unions--United States--History.
Supervisors, Industrial.
Harvard subject headings:
Automobile industry and trade--United States
Labor unions--United States
Supervisors, Industrial
Princeton subject headings:
Automobile industry and trade--United States.
Labor unions--United States.
Supervisors, Industrial.