Columbia subject headings:
Great Lakes (North America)--Description and travel.
Mississippi River--Description and travel.
Northwest, Old--Description and travel.
Harvard subject headings:
Great Lakes (North America)--Description and travel.
Mississippi River--Description and travel.
Northwest, Old--Description and travel.
Princeton subject headings:
Great Lakes (North America)--Description and travel.
Mississippi River--Description and travel.
Northwest, Old--Description and travel.