Columbia subject headings:
Harvard subject headings:
Industrial hygiene--Québec (Province)--History--19th century.
Industrial hygiene--Québec (Province)--History--20th century.
Industrial safety--Québec (Province)--History--19th century.
Industrial safety--Québec (Province)--History--20th century.
Princeton subject headings:
Industrial hygiene--Québec (Province)--History.
Industrial safety--Québec (Province)--History.