Columbia subject headings:
Families--Europe.
Family size--Europe.
Fertility, Human--Social aspects--Europe.
Unmarried couples--Europe.
Harvard subject headings:
Families--Europe.
Family size--Europe.
Fertility, Human--Social aspects--Europe.
Unmarried couples--Europe.
Princeton subject headings:
Families--Europe.
Family size--Europe.
Fertility, Human--Social aspects--Europe.
Unmarried couples--Europe.