Columbia subject headings:
Harvard subject headings:
Atlantic Wall (France and Belgium)--Pictorial works.
Fortification--France--Brittany--History--20th century--Pictorial works.
World War, 1939-1945--France--Brittany--Pictorial works.
Princeton subject headings:
Atlantic Wall (France and Belgium)--Pictorial works.
Brittany (France)--History, Military--Pictorial works.
Fortification--France--Brittany.--History.--20th century.--Pictorial works.