Columbia subject headings:
Harvard subject headings:
Communism--Spain
Communist International--History.
Russians--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Participation, Russian.
Princeton subject headings:
Communism--Spain.
Communist International--History.
Russians--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Participation, Russian.