Columbia subject headings:
Harvard subject headings:
Archives départementales du Nord--Catalogs.
Nord-Pas-de-Calais (France)--Economic conditions.
Regional planning--France--Nord-Pas-de-Calais.
Princeton subject headings:
Archives départementales du Nord--Catalogs.
Catalogs.
Nord-Pas-de-Calais (France)--Economic conditions.
Regional planning--France--Nord-Pas-de-Calais.