Columbia subject headings:
Harvard subject headings:
Hospitals--United States--History--19th century.
Hospitals--United States--History--20th century.
Medicine--United States--History--19th century
Medicine--United States--History--20th century.
Princeton subject headings:
Hospitals--United States--History--19th century.
Hospitals--United States--History--20th century.
Medicine--United States--History--19th century.
Medicine--United States--History--20th century.