Columbia subject headings:
ECN 1 Radio CNT-FAI (Spain)--History.
Radio broadcasting--Spain--History--20th century.
Harvard subject headings:
ECN 1 Radio CNT-FAI (Spain)--History.
Radio broadcasting--Political aspects--Spain.
Radio broadcasting--Spain--History--20th century.
Radio in politics--Spain.
Princeton subject headings:
ECN 1 Radio CNT-FAI (Spain)--History.
Radio broadcasting--Spain--History--20th century.