Columbia subject headings:
Boulogne-sur-Mer (France)--History.
World War, 1939-1945--France--Boulogne-sur-Mer.
World War, 1939-1945--Underground movements--France--Boulogne-sur-Mer.
Harvard subject headings:
Boulogne-sur-Mer (France)--History.
World War, 1939-1945--France--Boulogne-sur-Mer.
World War, 1939-1945--Underground movements--France--Boulogne-sur-Mer.
Princeton subject headings:
Boulogne-sur-Mer (France)--History.
World War, 1939-1945--France--Boulogne-sur-Mer.
World War, 1939-1945--Underground movements--France--Boulogne-sur-Mer.