Columbia subject headings:
Harvard subject headings:
Illustrated periodicals--History--19th century--Congresses.
Illustrated periodicals--History--20th century--Congresses.
Multimedia communications--Congresses.
Self-knowledge, Theory of--Congresses.
Princeton subject headings:
Illustrated periodicals--History--19th century--Congresses.
Illustrated periodicals--History--20th century--Congresses.