Columbia subject headings:
Harvard subject headings:
Plague--Québec (Province)--Montréal--History--19th century.
Smallpox--Québec (Province)--Montréal--History--19th century.
Princeton subject headings:
Plague--Quebec (Province)--Montréal--History--19th century.
Smallpox--Quebec (Province)--Montréal--History--19th century.