Columbia subject headings:
Belgium--Periodicals.
Europe--Periodicals.
Nord (France : Department)--Periodicals.
Pas-de-Calais (France)--Periodicals.
Harvard subject headings:
Europe, Northern--Economic conditions--Periodicals.
Europe, Northern--Periodicals.
Europe, Northern--Social conditions--Periodicals.
Princeton subject headings:
Belgium--Periodicals.
Europe, Northern--Periodicals.
Europe, Western--Periodicals.
Nord (France : Dept.)--Periodicals.
Pas-de-Calais (France)--Periodicals.
Periodicals.