Columbia subject headings:
Harvard subject headings:
Families--Germany--History--Congresses.
Family policy--Germany--History--Congresses.
Germany--Social conditions--Congresses.
Social change--Germany--History--Congresses.
Princeton subject headings:
Families--Germany--History--Congresses.
Family policy--Germany--History--Congresses.
Germany--Social conditions--Congresses.
Social change--Germany--History--Congresses.