Columbia subject headings:
Harvard subject headings:
Canada--History--Indexes--Periodicals.
Canada--History--Periodicals--Indexes--Periodicals.
Dissertations, Academic--Canada--Indexes--Periodicals.
Dissertations, Academic--United States--Indexes--Periodicals.
United States--History--Indexes--Periodicals.
United States--History--Periodicals--Indexes--Periodicals.
Princeton subject headings:
Canada--History--Bibliography--Periodicals.
United States--History--Bibliography--Periodicals.