Columbia subject headings:
Childbirth--Canada--History--20th century.
Obstetrics--Canada--History--20th century.
Harvard subject headings:
Childbirth--Canada--History--20th century.
Obstetrics--Canada--History--20th century.
Princeton subject headings:
Childbirth--Canada--History--20th century.
Obstetrics--Canada--History--20th century.