Columbia subject headings:
Harvard subject headings:
Childs, Marquis W. (Marquis William), 1903-1990.
Mississippi River Valley--Description and travel.
Mississippi River Valley--History.
Mississippi River--Description and travel.
Mississippi River--History.
Princeton subject headings:
Childs, Marquis W. (Marquis William), 1903-1990.
Mississippi River Valley--Description and travel.
Mississippi River Valley--History.
Mississippi River--Description and travel.
Mississippi River--History.