Columbia subject headings:
Environmental impact analysis--Mississippi River Watershed--History.
Watershed management--Environmental aspects--Mississippi River Watershed--History.
Watershed management--Social aspects--Mississippi River Watershed--History.
Harvard subject headings:
Environmental impact analysis--Mississippi River Watershed--History.
Mississippi River--Power utilization.
Mississippi River.
Watershed management--Environmental aspects--Mississippi River Watershed--History.
Watershed management--Social aspects--Mississippi River Watershed--History.
Princeton subject headings:
Environmental impact analysis--Mississippi River Watershed--History.
Watershed management--Environmental aspects--Mississippi River Watershed--History.
Watershed management--Social aspects--Mississippi River Watershed--History.