Columbia subject headings:
Harvard subject headings:
Dubois, Alfred, 1857-1934--Family.
Dubois, Alfred, 1857-1934.
Police--Quebec (Province)--Sainte-Hélène Island (Île-de-Montréal)
Police--Québec (Province)--Montréal.
Sainte-Hélène Island (Île-de-Montréal, Québec)--History.
Sainte-Hélène, Île (Montréal, Québec)--History.
Watchmen--Quebec (Province)--Sainte-Hélène Island (Île-de-Montréal)
Watchmen--Québec (Province)--Montréal.
Princeton subject headings:
Dubois family.
Dubois, Alfred, 1857-1934.
Police--Québec (Province)--Saint-Hélène Island (Île-de-Montréal)--History.
Sainte-Hélène Island (Île-de-Montréal, Québec)--History.