Columbia subject headings:
Anesthesia--United States--History--19th century.
Medicine--United States--History--19th century.
Pain--Social aspects--United States--History--19th century.
Surgery--United States--History--19th century.
Harvard subject headings:
Anesthesia--United States--History--19th century.
Medicine--United States--History--19th century
Pain--Social aspects--United States--History--19th century.
Surgery--United States--History--19th century.
Princeton subject headings:
Anesthesia--United States--History--19th century.
Medicine--United States--History--19th century.
Pain--Social aspects--United States--History--19th century.
Surgery--United States--History--19th century.