Columbia subject headings:
Madrid (Spain)--History--20th century.
Madrid (Spain)--History--Siege, 1936-1939.
Spain--History--Civil War, 1936-1939.
Harvard subject headings:
Madrid (Spain)--History--20th century.
Madrid (Spain)--History--Siege, 1936-1939.
Spain--History--Civil War, 1936-1939.
Princeton subject headings:
Madrid (Spain)--History--20th century.
Madrid (Spain)--History--Siege, 1936-1939.
Spain--History--Civil War, 1936-1939.