Columbia subject headings:
Miners--Great Britain--Case studies.
Salt workers--Great Britain--Case studies.
Stone-cutters--Great Britain--Case studies.
Harvard subject headings:
Miners--Great Britain--Case studies.
Salt workers--Great Britain--Case studies.
Stone-cutters--Great Britain--Case studies.
Princeton subject headings:
Miners--Great Britain--Case studies.
Salt workers--Great Britain--Case studies.
Stone-cutters--Great Britain--Case studies.