Columbia subject headings:
Harvard subject headings:
Brest (France)--Politics and government--20th century.
Spain--History--Civil War, 1936-1939--Naval operations--Submarine.
Spain--History--Civil War, 1936-1939--Secret service--France--Brest.
Princeton subject headings:
Brest (France)--Politics and government--20th century.
Spain--History--Secret service--Civil War, 1936-1939--History--Secret service--France--Brest.
Spain--Naval operations--Submarine--History--Civil War, 1936-1939--Naval operations--Submarine--History.