Columbia subject headings:
Smallpox vaccine.
Smallpox--History--18th century.
Smallpox--Vaccination.
Vaccinia--Early works to 1800.
Harvard subject headings:
Smallpox vaccine.
Smallpox--18th century.
Smallpox--Vaccination
Vaccinia--Early works to 1800.
Princeton subject headings:
Smallpox vaccine.
Smallpox--18th century.
Smallpox--Vaccination.
Vaccinia--Early works to 1800.