Columbia subject headings:
Harvard subject headings:
Belgium--Statistics, Vital--History--19th century.
Belgium--Statistics, Vital--History--20th century.
Children--Belgium--Mortality--History--19th century.
Children--Belgium--Mortality--History--20th century.
Infants--Belgium--Mortality--History--19th century.
Infants--Belgium--Mortality--History--20th century.
Princeton subject headings:
Belgium--Population--Statistics, Vital.
Infants--Belgium--Mortality--History.
Infants--Belgium--Mortality--Statistics.
Infants--Belgium--Mortality.