Columbia subject headings:
International Woodworkers of America--History.
Woodworkers--Labor unions--Canada--History.
Woodworkers--Labor unions--United States--History.
Harvard subject headings:
International Woodworkers of America--History.
Woodworkers--Labor unions--Canada--History.
Woodworkers--Labor unions--United States--History.
Princeton subject headings:
International Woodworkers of America--History.
Woodworkers--Labor unions--Canada--History.
Woodworkers--Labor unions--United States--History.