Columbia subject headings:
Communism--Spain--History.
Spain--History--Republic, 1931-1939.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Communism--Spain--History
Spain--History--Republic, 1931-1939.
Trotsky, Leon, 1879-1940
Princeton subject headings:
Communism--Spain--History.
Spain--History--Republic, 1931-1939.
Trotsky, Leon, 1879-1940.