Columbia subject headings:
Harvard subject headings:
Nord-Pas-de-Calais (France)--Description and travel.
Nord-Pas-de-Calais (France)--Economic conditions.
Nord-Pas-de-Calais (France)--History.
Princeton subject headings:
Nord-Pas-de-Calais (France)--Description and travel.
Nord-Pas-de-Calais (France)--Economic conditions.
Nord-Pas-de-Calais (France)--History.