Columbia subject headings:
Harvard subject headings:
France--History--German occupation, 1940-1945--Research--Congresses.
World War, 1939-1945--Underground movements--France--Congresses.
World War, 1939-1945--Underground movements--France--Research--Congresses.
Princeton subject headings:
World War, 1939-1945--Underground movements--Historiography--Congresses.