Columbia subject headings:
Hours of labor--England--History--18th century.
Hours of labor--England--History--19th century.
Harvard subject headings:
Hours of labor--England--History--18th century.
Hours of labor--England--History--19th century.
Labor--England--History--18th century.
Labor--England--History--19th century.
Princeton subject headings:
Hours of labor--England--History--18th century.