Columbia subject headings:
Art--Themes, motives--Congresses.
Emblems in art--Congresses.
Emblems in literature--Congresses.
Harvard subject headings:
Art--Themes, motives--Congresses.
Emblems in art--Congresses.
Emblems in literature--Congresses.
Princeton subject headings:
Art--Themes, motives--Congresses.
Emblems in art--Congresses.
Emblems in literature--Congresses.