Columbia subject headings:
Spies--Belgium--Biography.
Villiers, Jose.
World War, 1939-1945--Personal narratives, Belgian.
World War, 1939-1945--Secret service--Belgium.
World War, 1939-1945--Underground movements--Belgium.
Harvard subject headings:
World War, 1939-1945--Underground movements.
Princeton subject headings:
Villiers, Jose.
Women spies--Belgium--Biography.
World War, 1939-1945--Underground movements--Belgium.