Columbia subject headings:
Families--Germany--History--19th century--Statistics.
Families--Germany--History--19th century.
Families--Germany--History--20th century--Statistics.
Families--Germany--History--20th century.
Marriage law--Germany--History--19th century.
Marriage law--Germany--History--20th century.
Harvard subject headings:
Families--Germany--History--19th century--Statistics.
Families--Germany--History--19th century.
Families--Germany--History--20th century--Statistics.
Families--Germany--History--20th century.
Marriage law--Germany--History--19th century.
Marriage law--Germany--History--20th century.
Princeton subject headings:
Families--Germany.
Germany--Social conditions.
Germany--Social life and customs.