Columbia subject headings:
Harvard subject headings:
Labor unions--British Columbia--Political activity--History.
Labor unions--Political activity--British Columbia--History.
Labor unions--Political activity--Washington (State)--History.
Labor unions--Washington (State)--Political activity--History.
Socialism--British Columbia--History.
Socialism--British Columbia.
Socialism--Washington (State)
Socialism--Washington (State)--History.
Princeton subject headings:
Labor unions--British Columbia--Political activity--History.
Labor unions--Washington (State)--Political activity--History.
Socialism--British Columbia--History.
Socialism--Washington (State)--History.