Columbia subject headings:
Harvard subject headings:
Diseases and history--United States.
Diseases--United States--History.
Smallpox--United States--History.
United States--History, Military--To 1900.
United States--History.
Princeton subject headings:
Diseases and history--United States.
Diseases--United States--History.
United States--History, Military--To 1900.
United States--History.