Columbia subject headings:
Harvard subject headings:
Coal miners--France--Loire (Department)--History.
Coal miners--France--Loire (Dept.)--History.
Loire (France : Department)--History.
Loire (France : Département)--History.
Mineral industries--France--Loire (Department)--History.
Mineral industries--France--Loire (Dept.)--History.
Princeton subject headings:
Coal miners--France--Loire River Valley.
Coal mines and mining--France--Loire River Valley.