Columbia subject headings:
Massachusetts--Social conditions.
Unemployment--Massachusetts--History--19th century.
Unemployment--Massachusetts--History--20th century.
Harvard subject headings:
Massachusetts--Social conditions.
Unemployment--Massachusetts--History--19th century.
Unemployment--Massachusetts--History--20th century.
Princeton subject headings:
Massachusetts--Social conditions.
Unemployment--Massachusetts--History--19th century.
Unemployment--Massachusetts--History--20th century.