Columbia subject headings:
Families--Germany--History--20th century--Congresses.
Germany--Social conditions--20th century--Congresses.
Socialization--Congresses.
Harvard subject headings:
Families--Germany--20th century--Congresses.
Families--Germany--History--20th century--Congresses.
Germany--Social conditions--20th century--Congresses.
Socialization--Congresses
Princeton subject headings:
Families--Germany--History--20th century--Congresses.
Germany--Social conditions--20th century--Congresses.
Socialization--Congresses.