Columbia subject headings:
Calendar--History--Congresses.
Seasons in art--Congresses.
Seasons in literature--Congresses.
Seasons--Congresses.
Harvard subject headings:
Art, Modern--Themes, motives--Congresses.
Calendar--History--Congresses.
Seasons in art--Congresses.
Seasons in literature--Congresses.
Seasons--Congresses.
Princeton subject headings:
Calendar--History--Congresses.
Seasons in art--Congresses.
Seasons in literature--Congresses.
Seasons--Congresses.