Columbia subject headings:
Detroit (Mich.)--Commerce.
Industries--Michigan--Detroit.
Inland navigation--Canada.
Inland navigation--United States.
Harvard subject headings:
Detroit (Mich.)--Commerce.
Industries--Michigan--Detroit.
Inland navigation--Canada.
Inland navigation--United States.
Princeton subject headings:
Detroit (Mich.)--Commerce.
Industries--Michigan--Detroit.
Inland navigation--Canada.
Inland navigation--United States.