Columbia subject headings:
Maternal health services--New York (State)--New York--History--20th century.
Maternal health services--Pennsylvania--Philadelphia--History--20th century.
Mothers--Mortality--New York (State)--New York--History--20th century.
Mothers--Mortality--Pennsylvania--Philadelphia--History--20th century.
New York (N.Y.)--Statistics, Medical.
New York (N.Y.)--Statistics, Vital.
Philadelphia (Pa.)--Statistics, Medical.
Philadelphia (Pa.)--Statistics, Vital.
Pregnancy--Complications--New York (State)--New York--History--20th century.
Pregnancy--Complications--Pennsylvania--Philadelphia--History--20th century.
Harvard subject headings:
Princeton subject headings:
Maternal health services--New York (State)--New York--History--20th century.
Maternal health services--Pennsylvania--Philadephia--History--20th century.
Mothers--New York (State)--New York--Mortality--History--20th century.
Mothers--Pennsylvania--Philadelphia--Mortality--History--20th century.
New York (N.Y.)--Statistics, Medical.
Philadelphia (Pa.)--Statistics, Medical.
Philadelphia (Pa.)--Statistics, Vital.
Pregnancy--Complications--New York (State)--New York--History--20th century.
Pregnancy--Complications--Pennsylvania--Philadelphia--History--20th century.