Columbia subject headings:
Families--Germany--History--19th century.
Families--Germany--History--20th century.
Harvard subject headings:
Families--Germany--19th century.
Families--Germany--20th century.
Families--Germany--History--19th century.
Families--Germany--History--20th century.
Princeton subject headings:
Families--Germany--History--19th century.
Families--Germany--History--20th century.