Columbia subject headings:
Harvard subject headings:
Cities and towns--France--Pas-de-Calais--Pictorial works.
Pas-de-Calais (France)--History.
Postcards--France--Pas-de-Calais.
Princeton subject headings:
Cities and towns--France--Pas-de-Calais--Pictorial works.
Pas-de-Calais (France)--History.
Postcards--France--Pas-de-Calais.