Columbia subject headings:
Harvard subject headings:
Diseases--Causes and theories of causation--Early works to 1800.
Scurvy--Early works to 1800.
Smallpox--Early works to 1800
Princeton subject headings:
Diseases--Causes and theories of causation--Early works to 1800.
Scurvy--Early works to 1800.
Smallpox--Early works to 1800.