Columbia subject headings:
Espionage, Polish--France--History--20th century.
Great Britain--Foreign relations--Poland.
Intelligence service--Poland--History--20th century.
Poland--Foreign relations--Great Britain.
World War, 1939-1945--Diplomatic history.
Harvard subject headings:
Espionage, Polish--France--History--20th century.
Great Britain--Foreign relations--Poland.
Intelligence service--Poland--History--20th century.
Poland--Foreign relations--Great Britain.
World War, 1939-1945--Diplomatic history.
Princeton subject headings:
Espionage, Polish--France--History.
Great Britain--Foreign relations--Poland.
Intelligence service--Poland--History.
Poland--Foreign relations--Great Britain.
World War, 1939-1945--Diplomatic history.