Columbia subject headings:
Harvard subject headings:
Communication--Europe--History--Congresses.
Europe--History--1492---Congresses.
Habermas, Jürgen--Criticism and interpretation--Congresses.
Political participation--Europe--History--Congresses.
Public interest--Europe--History--Congresses.
Public opinion--Europe--History--Congresses.
Public opinion--Europe--Philosophy--Congresses.
Princeton subject headings:
Public opinion--Europe--History--16th century.
Public opinion--Europe--History--17th century.
Public opinion--Europe--History--18th century.