Columbia subject headings:
Smallpox vaccine--History--19th century.
Smallpox--Vaccination--History--18th century.
Smallpox--Vaccination--History--19th century.
Harvard subject headings:
Communicable diseases--Prevention--History.
Smallpox vaccine--History--19th century.
Smallpox--Vaccination--History--18th century.
Smallpox--Vaccination--History--19th century.
Vaccination--History
Princeton subject headings:
Medicine, Preventive--History--19th century.
Smallpox--Vaccination--History--19th century.
Social medicine--History--19th century.
Vaccination--History--19th century.