Columbia subject headings:
Military assistance, Soviet--Spain.
Soviet Union--Foreign relations--Spain.
Spain--Foreign relations--Soviet Union.
Harvard subject headings:
Military assistance, Soviet--Spain.
Soviet Union--Foreign relations--Spain.
Soviet Union--History--1925-1953.
Soviet Union--Military relations--Spain.
Spain--Foreign relations--Soviet Union.
Spain--History--20th century.
Spain--Military relations--Soviet Union.
Princeton subject headings:
Military assistance, Soviet--Spain.
Soviet Union--History--1925-1953.
Soviet Union--Military relations--Spain.
Spain--History--20th century.
Spain--Military relations--Soviet Union.