Columbia subject headings:
Industrial Workers of the World--History.
Labor unions--Ohio--History--20th century.
Syndicalism--Ohio--History--20th century.
Harvard subject headings:
Industrial Workers of the World--History.
Labor unions--Ohio--History--20th century.
Syndicalism--Ohio--History--20th century.
Princeton subject headings:
Industrial Workers of the World--History.
Labor unions--Ohio--History--20th century.
Syndicalism--Ohio--History--20th century.