Columbia subject headings:
Mass media and literature--Mexico--20th century.
Mass media and literature--Spain--20th century.
Motion pictures--Mexico--History.
Motion pictures--Spain--History.
Radio broadcasting--Mexico--History.
Radio broadcasting--Spain--History.
Harvard subject headings:
Mass media and literature--Mexico--20th century.
Mass media and literature--Spain--20th century.
Motion pictures--Mexico--History
Motion pictures--Spain--History
Radio broadcasting--Mexico--History.
Radio broadcasting--Spain--History.
Princeton subject headings:
Mass media and literature--Mexico--20th century.
Mass media and literature--Spain--20th century.
Motion pictures--Mexico--History.
Motion pictures--Spain--History.
Radio broadcasting--Mexico--History.
Radio broadcasting--Spain--History.