Columbia subject headings:
Coal mines and mining--Government ownership--Great Britain.
Coal mines and mining--Great Britain.
Industrial relations--Great Britain.
Strikes and lockouts--Coal mining--Great Britain.
Harvard subject headings:
Coal mines and mining--Government ownership--Great Britain.
Coal mines and mining--Great Britain
Industrial relations--Great Britain
Princeton subject headings:
Coal mines and mining--Government ownership--Great Britain.
Coal mines and mining--Great Britain.
Industrial relations--Great Britain.
Strikes and lockouts--Coal mining--Great Britain.