Columbia subject headings:
Skilled labor--Great Britain--History--19th century.
Technological innovations--Great Britain--History--19th century.
Harvard subject headings:
Skilled labor--Great Britain--History--19th century.
Technological innovations--Great Britain--History--19th century.
Princeton subject headings:
Skilled labor--Great Britain--History--19th century.
Technological innovations--Great Britain--History--19th century.