Columbia subject headings:
Spain--History--Civil War, 1936-1939--Congresses.
Harvard subject headings:
Spain--History--Civil War, 1936-1939--Congresses.
Spain--History--Civil War, 1936-1939--Historiography--Congresses.
Spain--History--Civil War, 1936-1939--Periodicals--Bibliography--Congresses.
Spain--History--Civil War, 1936-1939--Sources--Congresses.
Princeton subject headings:
Spain--History--Civil War, 1936-1939--Congresses.