Columbia subject headings:
Europe--Social life and customs--Congresses.
Families--Europe--History--Congresses.
Kinship--Europe--History--Congresses.
Marriage--Europe--History--Congresses.
Harvard subject headings:
Europe--Social life and customs--Congresses.
Families--Europe--History--Congresses.
Kinship--Europe--History--Congresses.
Marriage--Europe--History--Congresses.
Princeton subject headings:
Europe--Social life and customs--Congresses.
Families--Europe--History--Congresses.
Kinship--Europe--History--Congresses.
Marriage--Europe--History--Congresses.