Columbia subject headings:
Coal miners--Labor unions--England--Nottinghamshire--History--Sources.
Nottinghamshire Miners' Industrial Union--History--Sources.
Harvard subject headings:
Coal miners--Labor unions--England--Nottinghamshire--History--Sources.
Nottinghamshire Miners' Industrial Union--History--Sources.
Princeton subject headings:
Labor unions--England--Nottinghamshire--Records and correspondence.
Nottinghamshire Miners' Industrial Union--Records and correspondence.