Columbia subject headings:
Communication--History--Congresses.
Communication--Technological innovations--Congresses.
Mass media--History--Congresses.
Mass media--Technological innovations--Congresses.
Harvard subject headings:
Communication--History--Congresses.
Communication--Technological innovations--Congresses
Mass media--History--Congresses.
Mass media--Technological innovations--Congresses.
Princeton subject headings:
Communication--History--Congresses.
Communication--Technological innovations--Congresses.
Mass media--History--Congresses.
Mass media--Technological innovations--Congresses.