Columbia subject headings:
Cotton trade--Southern States--History.
Rice trade--Southern States--History.
Tobacco industry--Southern States--History.
Harvard subject headings:
Cotton trade--Southern States--History.
Rice trade--Southern States--History.
Tobacco industry--Southern States--History.
Princeton subject headings:
Cotton trade--Southern States--History.
Rice trade--Southern States--History.
Tobacco industry--Southern States--History.