Columbia subject headings:
Detroit River (Mich. and Ont.)--Periodicals.
Sault Sainte Marie Canal (Mich.)--Periodicals.
Shipping--Great Lakes (North America)--Periodicals.
Shipping--United States--Statistics--Periodicals.
Harvard subject headings:
Detroit River (Mich. and Ont.)--Periodicals.
Sault Sainte Marie Canal (Mich.)--Periodicals.
Shipping--Great Lakes--Periodicals.
Shipping--United States--Statistics--Periodicals.
Princeton subject headings:
Detroit River (Mich. and Ont.)--Periodicals.
Periodicals.
Sault Sainte Marie Canal (Mich.)--Periodicals.
Shipping--Great Lakes--Periodicals.
Shipping--United States--Statistics--Periodicals.
Statistics.