Columbia subject headings:
Denmark--Population--History--Statistics.
Denmark--Social conditions.
Family size--Denmark.
Fertility, Human--Denmark.
Harvard subject headings:
Denmark--Population--History--Statistics.
Denmark--Social conditions.
Family size--Denmark.
Fertility, Human--Denmark.
Princeton subject headings:
Birth control--Denmark.
Denmark--Statistics, Vital.
Family size--Denmark.
Fertility, Human--Denmark.