Columbia subject headings:
Contract system (Labor)--Great Britain--History.
Stevedores--Great Britain--History.
Unemployment--Great Britain--History.
Harvard subject headings:
Contract system (Labor)--Great Britain--History.
Stevedores--Great Britain--History.
Unemployment--Great Britain--History.
Princeton subject headings:
Casual labor--Great Britain--History.
Stevedores--Great Britain--History.